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Zone 5a Planting Calendar & Schedule

Zone 5 has cold, snowy winters (annual lows of -20 to -10°F) and warm summers, giving a moderate but distinctly four-season climate with a roughly 5-month frost-free growing window. Spring warms slowly and the first hard fall freeze arrives by mid-October, so heat-loving crops must be started indoors and frost-tender work is bracketed tightly between mid-May and early October.

Last Spring Frost: May 22 First Fall Frost: Oct 1 132-Day Growing Season

Zone 5a is the cooler half of USDA zone 5, where the average coldest winter night bottoms out at −20 to −15°F. Compared with the zone 5 averages, the last spring frost in zone 5a comes about a week later (May 22) and the first fall frost about a week earlier (Oct 1), for a growing season of about 132 days. Every planting window on this page is shifted to match: spring sowing and transplant dates move a week later, fall plantings a week earlier. Crop notes still quote zone 5 timing.

Zone 5 is the classic upper-Midwest and Northeast garden belt: Iowa, Nebraska, the Chicago area, Ohio, Indiana, interior Pennsylvania, central New York, and Colorado's Front Range. Lows of -20 to -10°F and a 146-day season support one full main season of corn, tomatoes, and squash. Sow a second round of lettuce, spinach, and radishes by early August and the salad harvest runs into October.

States & regions in Zone 5: Iowa, Nebraska, southern Wisconsin, southern Minnesota, northern Illinois (Chicago area), Ohio, Indiana, Pennsylvania (interior), much of Colorado's Front Range foothills, central New York, New England interior (Vermont, New Hampshire valleys), northern Missouri

What to Plant in Zone 5a This Fall (September–November)

The average first fall frost in zone 5a is Oct 1. To find the last safe planting date for any fall crop, count back from that date by its days to maturity plus a 14-day fall factor — growth slows as days shorten and soil cools. Applied to zone 5a's frost date, that gives these plant-by dates:

Carrots

Plant by Jul 9

70 days to maturity + 14-day fall factor

Beets

Plant by Jul 19

60 days to maturity + 14-day fall factor

Kale

Plant by Jul 24

55 days to maturity + 14-day fall factor

Spinach

Plant by Aug 3

45 days to maturity + 14-day fall factor

Zone 5a and 5b: these dates count back from zone 5a's first frost, which is about a week earlier than the zone 5 average of Oct 8. Zone 5b gardeners have about two weeks more fall time — see the zone 5b fall dates.

Fall crops on this zone 5a calendar include Spinach, Lettuce, Arugula, Mizuna, Tatsoi, Mustard Greens, Radish, Daikon Radish, Turnip, Beet, Carrot, Kale, and 13 more. Each crop's sowing and transplant window is in the fall planting section below.

For month-by-month detail, see what to plant in October across every zone, what to plant in September, and the fall vegetable planting guide by zone.

What to Plant by Season in Zone 5a

The right crops and methods for each season, based on zone 5a's climate and frost timing.

What to Plant in Spring

Spring is the busiest planting window in zone 5: cold-hardy greens, roots, peas and brassicas go in as soon as soil is workable (late March to April), while warm-season crops are started indoors under lights for transplanting after the May 15 last frost. Watch for late frosts through late May and harden off transplants gradually.

Garden Pea Direct sow

Mar 28 - May 7

Sow as soon as soil can be worked; tolerates light frost.

Snap / Snow Pea Direct sow

Mar 28 - May 7

Direct sow early; trellis tall varieties.

Spinach Direct sow

Mar 28 - May 7

Cold-hardy; bolts once heat arrives, so sow early.

Lettuce Direct sow

Mar 28 - Jun 7

Succession sow every 2 weeks; transplants also work.

Arugula Direct sow

Mar 28 - May 7

Fast and frost-tolerant.

Radish Direct sow

Mar 28 - Jun 7

Ready in 25-30 days; succession sow.

Carrot Direct sow

Apr 8 - Jun 7

Sow once soil is workable; keep seedbed moist for germination.

Beet Direct sow

Apr 8 - Jun 7

Tolerates light frost; thin for good roots.

Turnip Direct sow

Apr 8 - Jun 7

Quick spring crop; harvest before summer heat.

Parsnip Direct sow

Apr 8 - May 17

Slow to germinate; flavor improves with fall frost.

Potato Direct sow

Apr 8 - May 17

Plant seed potatoes 2-4 weeks before last frost; hill as they grow.

Onion (Bulb) Transplant

Apr 8 - May 7

Use long-day varieties; transplant seedlings or sets early.

Scallion / Green Onion Direct sow

Apr 8 - Jun 7

Very cold tolerant.

Shallot Plant sets / crowns

Apr 8 - May 7

Plant sets early; harvest mid-summer.

Leek Transplant

Apr 8 - Jun 7

Start indoors in Feb-Mar; transplant and blanch stems.

Broccoli Transplant

Apr 8 - May 17

Start indoors 5-6 weeks earlier; tolerates light frost.

Cauliflower Transplant

Apr 8 - May 17

Needs steady moisture; blanch heads.

Cabbage Transplant

Apr 8 - May 17

Hardy transplant; set out before last frost.

Kohlrabi Transplant

Apr 8 - Jun 7

Fast brassica; harvest before bulbs get woody.

Kale Transplant

Apr 8 - Jun 7

Very cold-hardy; direct sow also works.

Swiss Chard Direct sow

Apr 8 - Jun 7

Heat and cold tolerant; one of the longest-cropping greens.

Collards Transplant

Apr 8 - Jun 7

Hardy and heat tolerant; long harvest.

Mustard Greens Direct sow

Apr 8 - Jun 7

Fast spicy greens; bolt in heat.

Bok Choy / Pak Choi Transplant

Apr 8 - May 7

Bolts in heat; best as a cool-spring crop.

Cilantro / Coriander Direct sow

Apr 8 - Jun 7

Bolts in summer heat; succession sow.

Dill Direct sow

Apr 8 - Jun 7

Direct sow; self-seeds readily.

Parsley Transplant

Apr 8 - Jun 7

Slow germinator; start indoors or buy transplants.

Chives Transplant

Apr 8 - Jun 7

Perennial; divides easily.

Fava Bean Direct sow

Mar 28 - May 7

Cool-season legume; sow as early as soil permits.

Tomato Start indoors

Mar 28 - May 7

Start indoors 6-8 weeks before May 15; transplant after frost.

Pepper (Bell & Hot) Start indoors

Mar 8 - Apr 7

Start indoors 8-10 weeks early; slow growers.

Eggplant Start indoors

Mar 8 - Apr 7

Needs warmth; start indoors 8-10 weeks before last frost.

Basil Start indoors

Apr 8 - May 7

Very frost-sensitive; start indoors, set out late May.

Asparagus Plant sets / crowns

Apr 8 - May 17

Plant crowns in a permanent bed; first real harvest year 3.

Rhubarb Plant sets / crowns

Apr 8 - May 7

Plant crowns; perennial, do not harvest first year.

Strawberry Transplant

Apr 8 - Jun 7

Plant bare-root crowns in early spring; pinch first-year blooms.

What to Plant in Summer

Summer is the main warm-season window: after the May 15 last frost, transplant tomatoes, peppers and other heat-lovers and direct sow beans, squash and corn into warm soil. Mid-summer is also the time to start fall brassicas and to sow heat-tolerant successions before the days shorten.

Tomato Transplant

May 28 - Jun 17

Set out after May 15; stake or cage and mulch.

Pepper (Bell & Hot) Transplant

May 28 - Jun 17

Wait for warm nights (above 55°F) before transplanting.

Eggplant Transplant

May 28 - Jun 17

Loves heat; use row cover early to hold warmth.

Tomatillo Transplant

May 28 - Jun 17

Plant at least two for pollination.

Ground Cherry Transplant

May 28 - Jun 17

Sprawling habit; fruit ready when husks drop.

Cucumber Direct sow

May 28 - Jul 7

Sow in warm soil; trellis to save space.

Zucchini Direct sow

May 28 - Jul 7

Extremely productive; one or two plants is plenty.

Summer Squash Direct sow

May 28 - Jul 7

Harvest young and often.

Winter Squash Direct sow

May 28 - Jun 17

Needs full season; sow promptly after frost to mature by October.

Pumpkin Direct sow

May 28 - Jun 17

Long season; sow early for Halloween-size fruit.

Husk-less / Pie Pumpkin Direct sow

May 28 - Jun 17

Sow promptly to reach maturity before fall frost.

Muskmelon / Cantaloupe Transplant

May 28 - Jun 17

Use black plastic mulch and row cover for heat in zone 5.

Watermelon Transplant

May 28 - Jun 17

Choose short-season varieties; needs warm soil and heat.

Corn (Sweet) Direct sow

May 28 - Jul 7

Plant in blocks for pollination; soil must be warm.

Bush Bean Direct sow

May 28 - Aug 7

Succession sow every 2-3 weeks for continuous harvest.

Pole Bean Direct sow

May 28 - Jul 7

Trellis; produces over a long window.

Lima Bean Direct sow

May 28 - Jul 7

Needs warm soil and full season; choose early varieties in zone 5.

Edamame (Soybean) Direct sow

May 28 - Jul 7

Harvest pods when plump and bright green.

Pole/Runner Bean (Scarlet) Direct sow

May 28 - Jul 7

Attractive flowers; pick pods young.

Cowpea / Southern Pea Direct sow

Jun 8 - Jul 7

Heat-loving; sow once soil is thoroughly warm.

Okra Transplant

Jun 8 - Jul 7

Needs steady heat; start indoors and transplant into the warmest spot.

Amaranth (Leaf) Direct sow

May 28 - Jul 7

Heat-tolerant green; harvest leaves young.

New Zealand Spinach Direct sow

May 28 - Jul 7

Heat-tolerant spinach substitute for summer harvest.

Basil Transplant

May 28 - Jul 7

Pinch tops to keep it bushy; never let it frost.

Sunflower Direct sow

May 28 - Jul 7

Direct sow; choose dwarf or mammoth as desired.

Zinnia Direct sow

May 28 - Jul 7

Heat-loving cut flower; deadhead for more blooms.

Marigold Transplant

May 28 - Jul 7

Good pest-deterrent companion among vegetables.

Cosmos Direct sow

May 28 - Jul 7

Thrives in lean soil; great pollinator plant.

Nasturtium Direct sow

May 28 - Jul 7

Edible flowers; trap crop for aphids.

Broccoli Start indoors

Jun 8 - Aug 7

Start fall crop indoors mid-summer for a September harvest.

Cabbage Start indoors

Jun 8 - Aug 7

Start fall heads now; transplant in late July.

What to Plant in Fall

Fall in zone 5 is for cool-season successions and harvest: quick greens and roots sown in late summer mature into the cooler, sweeter days of September and October, and fall-planted garlic goes in for next year. Use row covers and cold frames to push harvests past the October 8 first frost.

Spinach Direct sow

Jul 25 - Sep 3

Cold-hardy; can overwinter under mulch for an early spring crop.

Lettuce Direct sow

Jul 25 - Sep 3

Cooler fall days improve flavor; protect from first frosts.

Arugula Direct sow

Jul 25 - Sep 23

Thrives in fall cool; very frost-tolerant.

Mizuna Direct sow

Jul 25 - Sep 23

Fast mild mustard; great in fall salad mixes.

Tatsoi Direct sow

Jul 25 - Sep 23

Cold-hardy Asian green; sweetens after frost.

Mustard Greens Direct sow

Jul 25 - Sep 23

Spicy fall green; tolerates light frost.

Radish Direct sow

Jul 25 - Sep 23

Quick fall crop; sow up to ~4 weeks before frost.

Daikon Radish Direct sow

Jul 25 - Aug 24

Sow by mid-August for full-size roots before hard freeze.

Turnip Direct sow

Jul 25 - Aug 24

Fall roots sweeten with frost; greens are edible too.

Beet Direct sow

Jul 28 - Sep 7

Fall crop matures in cool weather; mulch to extend.

Carrot Direct sow

Jul 28 - Aug 17

Fall carrots are sweetest after frost; mulch heavily to overwinter.

Kale Transplant

Jul 25 - Aug 24

Frost makes it sweeter; harvest well into November under cover.

Collards Transplant

Jul 25 - Aug 24

Very frost-hardy; flavor improves after a freeze.

Swiss Chard Direct sow

Jul 28 - Sep 7

Keeps cropping into fall; protect from hard freezes.

Broccoli Transplant

Jul 28 - Sep 7

Set out summer-started transplants for a fall harvest.

Cauliflower Transplant

Jul 28 - Sep 7

Fall heads form in cool weather; needs steady moisture.

Cabbage Transplant

Jul 28 - Sep 7

Fall cabbage stores well; tolerates frost.

Napa Cabbage Transplant

Jul 28 - Sep 7

Best as a fall crop; bolts in spring heat.

Bok Choy / Pak Choi Direct sow

Jul 25 - Aug 24

Fall planting avoids spring bolting.

Kohlrabi Direct sow

Jul 25 - Aug 24

Fast fall bulbs; sweetens in cool weather.

Pac/Corn Salad (Mâche) Direct sow

Aug 25 - Sep 23

Extremely cold-hardy; overwinters for very early spring greens.

Claytonia (Miner's Lettuce) Direct sow

Aug 25 - Sep 23

Cold-frame green; harvests through winter under cover.

Cilantro / Coriander Direct sow

Jul 25 - Sep 23

Fall cool keeps it from bolting quickly.

Garlic Plant sets / crowns

Sep 14 - Oct 24

Plant cloves 4-6 weeks before ground freezes; mulch heavily.

Garden Pea Direct sow

Jul 28 - Aug 17

Fall pea crop matures before hard frost if sown early enough.

What to Plant in Winter

Outdoor planting essentially stops in zone 5 winter — the ground freezes and snow cover is common. This is the season for indoor seed-starting under lights, garden planning and ordering, protecting overwintering crops (mulched garlic, carrots, mâche in cold frames), and harvesting from cold frames or storage rather than sowing outdoors.

Pepper (Bell & Hot) Start indoors

Feb 28 - Apr 7

Slow to germinate; start indoors under lights for May transplant.

Onion (Bulb) Start indoors

Jan 8 - Mar 7

Long-day onions need an early indoor start to size up.

Leek Start indoors

Feb 8 - Mar 7

Start indoors early; long season to maturity.

Celery Start indoors

Feb 8 - Mar 7

Very slow from seed; needs a long indoor head start.

Celeriac Start indoors

Feb 8 - Mar 7

Long season; start indoors in late winter.

Eggplant Start indoors

Feb 28 - Apr 7

Needs warmth and a long start; sow indoors under lights.

Tomato Start indoors

Mar 8 - Apr 7

Start 6-8 weeks before May 15; not before late winter to avoid leggy plants.

Full Planting Timing Table

Start-indoors, direct-sow, transplant, and harvest windows for every crop in zone 5a.

Vegetables

Plant Start Indoors Direct Sow Transplant Harvest Notes
Amaranth (Leaf) — May 28 - Jul 7 — — Heat-tolerant green; harvest leaves young.
Arugula — Mar 28 - May 7 — — Thrives in fall cool; very frost-tolerant.
Asparagus — — Apr 8 - May 17 — Plant crowns in a permanent bed; first real harvest year 3.
Beet — Jul 28 - Sep 7 — — Tolerates light frost; thin for good roots.
Bok Choy / Pak Choi — Jul 25 - Aug 24 Apr 8 - May 7 — Fall planting avoids spring bolting.
Broccoli Jun 8 - Aug 7 — Jul 28 - Sep 7 — Set out summer-started transplants for a fall harvest.
Bush Bean — May 28 - Aug 7 — — Succession sow every 2-3 weeks for continuous harvest.
Cabbage Jun 8 - Aug 7 — Jul 28 - Sep 7 — Fall cabbage stores well; tolerates frost.
Carrot — Jul 28 - Aug 17 — — Sow once soil is workable; keep seedbed moist for germination.
Cauliflower — — Jul 28 - Sep 7 — Fall heads form in cool weather; needs steady moisture.
Celeriac Feb 8 - Mar 7 — — — Long season; start indoors in late winter.
Celery Feb 8 - Mar 7 — — — Very slow from seed; needs a long indoor head start.
Claytonia (Miner's Lettuce) — Aug 25 - Sep 23 — — Cold-frame green; harvests through winter under cover.
Collards — — Jul 25 - Aug 24 — Very frost-hardy; flavor improves after a freeze.
Corn (Sweet) — May 28 - Jul 7 — — Plant in blocks for pollination; soil must be warm.
Cowpea / Southern Pea — Jun 8 - Jul 7 — — Heat-loving; sow once soil is thoroughly warm.
Cucumber — May 28 - Jul 7 — — Sow in warm soil; trellis to save space.
Daikon Radish — Jul 25 - Aug 24 — — Sow by mid-August for full-size roots before hard freeze.
Edamame (Soybean) — May 28 - Jul 7 — — Harvest pods when plump and bright green.
Eggplant Mar 8 - Apr 7 — May 28 - Jun 17 — Loves heat; use row cover early to hold warmth.
Fava Bean — Mar 28 - May 7 — — Cool-season legume; sow as early as soil permits.
Garden Pea — Mar 28 - May 7 — — Sow as soon as soil can be worked; tolerates light frost.
Garlic — — Sep 14 - Oct 24 — Plant cloves 4-6 weeks before ground freezes; mulch heavily.
Husk-less / Pie Pumpkin — May 28 - Jun 17 — — Sow promptly to reach maturity before fall frost.
Kale — — Jul 25 - Aug 24 — Frost makes it sweeter; harvest well into November under cover.
Kohlrabi — Jul 25 - Aug 24 Apr 8 - Jun 7 — Fast brassica; harvest before bulbs get woody.
Leek Feb 8 - Mar 7 — Apr 8 - Jun 7 — Start indoors early; long season to maturity.
Lettuce — Mar 28 - Jun 7 — — Cooler fall days improve flavor; protect from first frosts.
Lima Bean — May 28 - Jul 7 — — Needs warm soil and full season; choose early varieties in zone 5.
Mizuna — Jul 25 - Sep 23 — — Fast mild mustard; great in fall salad mixes.
Mustard Greens — Jul 25 - Sep 23 — — Spicy fall green; tolerates light frost.
Napa Cabbage — — Jul 28 - Sep 7 — Best as a fall crop; bolts in spring heat.
New Zealand Spinach — May 28 - Jul 7 — — Heat-tolerant spinach substitute for summer harvest.
Okra — — Jun 8 - Jul 7 — Needs steady heat; start indoors and transplant into the warmest spot.
Onion (Bulb) Jan 8 - Mar 7 — Apr 8 - May 7 — Long-day onions need an early indoor start to size up.
Pac/Corn Salad (Mâche) — Aug 25 - Sep 23 — — Extremely cold-hardy; overwinters for very early spring greens.
Parsnip — Apr 8 - May 17 — — Slow to germinate; flavor improves with fall frost.
Pepper (Bell & Hot) Mar 8 - Apr 7 — May 28 - Jun 17 — Slow to germinate; start indoors under lights for May transplant.
Pole Bean — May 28 - Jul 7 — — Trellis; produces over a long window.
Pole/Runner Bean (Scarlet) — May 28 - Jul 7 — — Attractive flowers; pick pods young.
Potato — Apr 8 - May 17 — — Plant seed potatoes 2-4 weeks before last frost; hill as they grow.
Pumpkin — May 28 - Jun 17 — — Long season; sow early for Halloween-size fruit.
Radish — Mar 28 - Jun 7 — — Ready in 25-30 days; succession sow.
Rhubarb — — Apr 8 - May 7 — Plant crowns; perennial, do not harvest first year.
Scallion / Green Onion — Apr 8 - Jun 7 — — Very cold tolerant.
Shallot — — Apr 8 - May 7 — Plant sets early; harvest mid-summer.
Snap / Snow Pea — Mar 28 - May 7 — — Direct sow early; trellis tall varieties.
Spinach — Mar 28 - May 7 — — Cold-hardy; can overwinter under mulch for an early spring crop.
Summer Squash — May 28 - Jul 7 — — Harvest young and often.
Swiss Chard — Jul 28 - Sep 7 — — Keeps cropping into fall; protect from hard freezes.
Tatsoi — Jul 25 - Sep 23 — — Cold-hardy Asian green; sweetens after frost.
Tomatillo — — May 28 - Jun 17 — Plant at least two for pollination.
Tomato Mar 8 - Apr 7 — May 28 - Jun 17 — Set out after May 15; stake or cage and mulch.
Turnip — Jul 25 - Aug 24 — — Quick spring crop; harvest before summer heat.
Winter Squash — May 28 - Jun 17 — — Needs full season; sow promptly after frost to mature by October.
Zucchini — May 28 - Jul 7 — — Extremely productive; one or two plants is plenty.

Herbs

Plant Start Indoors Direct Sow Transplant Harvest Notes
Basil Apr 8 - May 7 — May 28 - Jul 7 — Pinch tops to keep it bushy; never let it frost.
Chives — — Apr 8 - Jun 7 — Perennial; divides easily.
Cilantro / Coriander — Jul 25 - Sep 23 — — Fall cool keeps it from bolting quickly.
Dill — Apr 8 - Jun 7 — — Direct sow; self-seeds readily.
Parsley — — Apr 8 - Jun 7 — Slow germinator; start indoors or buy transplants.

Fruits

Plant Start Indoors Direct Sow Transplant Harvest Notes
Ground Cherry — — May 28 - Jun 17 — Sprawling habit; fruit ready when husks drop.
Muskmelon / Cantaloupe — — May 28 - Jun 17 — Use black plastic mulch and row cover for heat in zone 5.
Strawberry — — Apr 8 - Jun 7 — Plant bare-root crowns in early spring; pinch first-year blooms.
Watermelon — — May 28 - Jun 17 — Choose short-season varieties; needs warm soil and heat.

Flowers

Plant Start Indoors Direct Sow Transplant Harvest Notes
Cosmos — May 28 - Jul 7 — — Thrives in lean soil; great pollinator plant.
Marigold — — May 28 - Jul 7 — Good pest-deterrent companion among vegetables.
Nasturtium — May 28 - Jul 7 — — Edible flowers; trap crop for aphids.
Sunflower — May 28 - Jul 7 — — Direct sow; choose dwarf or mammoth as desired.
Zinnia — May 28 - Jul 7 — — Heat-loving cut flower; deadhead for more blooms.

Zone 5a vs Zone 5b

USDA divides zone 5 into two half-zones 5°F apart. Zone 5a is the cooler one; here is how its frost dates compare with zone 5b and the zone 5 average.

Zone 5a Zone 5 Zone 5b
Winter low −20 to −15°F −20 to −10°F −15 to −10°F
Last spring frost May 22 May 15 May 8
First fall frost Oct 1 Oct 8 Oct 15
Growing season 132 days 146 days 160 days

Not sure which half you're in? The half-zone comes from your area's average coldest winter night, so check the USDA map for your ZIP code. Your own microclimate — slope, shelter, pavement, elevation — can move dates as much as the half-zone does.

Zone 5a Growing Tips

Frequently Asked Questions

What can I plant in spring in zone 5a?

In zone 5a, spring planting includes Garden Pea, Snap / Snow Pea, Spinach, Lettuce, Arugula, Radish, Carrot, Beet, and more. See the spring section above for each crop's timing.

What is the last frost date for zone 5a?

The average last spring frost date for USDA zone 5a is May 22. The first fall frost typically arrives around Oct 1, giving a growing season of approximately 132 days.

When is the first frost in zone 5a?

The average first fall frost in USDA zone 5a arrives around Oct 1. That is an average, not a guarantee — the actual first frost varies by up to 2 weeks either way, so watch your local forecast from a few weeks before that date and have row covers ready for tender crops still in the ground.

When can I start seeds indoors in zone 5a?

In zone 5a, start crops like Tomato indoors around Mar 28 - May 7. Check the seasonal sections above for each crop's indoor-sowing window.

What can I plant in fall in zone 5a?

Fall planting in zone 5a includes Spinach, Lettuce, Arugula, Mizuna, Tatsoi, Mustard Greens, Radish, Daikon Radish, and more.

How long is the growing season in zone 5a?

Zone 5a has an average growing season of 132 days, from the last spring frost around May 22 to the first fall frost around Oct 1.

What is the difference between zone 5a and zone 5b?

Zone 5a is the cooler half of USDA zone 5, with average coldest winter nights of −20 to −15°F. Compared with the zone 5 averages (last frost May 15, first frost Oct 8), zone 5a's last spring frost is about a week later (May 22) and its first fall frost about a week earlier (Oct 1), so zone 5b gardeners plant about two weeks earlier in spring and later in fall than zone 5a.