Brought to you by garden.gg Brought to you by garden.gg USDA zone 3 is a cold continental climate with long, harsh winters (annual minimums of -40 to -30°F) and a short, intense growing season of roughly 90-115 frost-free days. Warm spells arrive late and frost returns early, so heat-loving crops require indoor starting and season-extension to mature.
States & regions in Zone 3: Northern Minnesota (Duluth, International Falls), Northern North Dakota & Montana (Bismarck, Glasgow), Northern Wisconsin, Interior/northern Maine (Caribou), Northern New Hampshire & Vermont mountains, High-elevation Wyoming & Colorado Rockies, Upper Michigan (interior)
With just 120 frost-free days, zone 3 gardeners can't afford to guess. Every week matters when you're racing against September frost. That's why tracking your planting dates, frost alerts, and harvest windows isn't optional — it's survival.
Pro tip: Start seeds indoors in March to get a head start. Use season extenders like cold frames and row covers to squeeze out extra weeks on both ends.
Start tracking your zone 3 garden — free
The right crops and methods for each season, based on zone 3's climate and frost timing.
Spring in zone 3 is short and unpredictable, with hard frosts possible into early June. Cold-tolerant greens, roots, and brassicas go in as soon as soil can be worked (mid-to-late April), while warm-season crops are started indoors under lights and held until after the last frost.
Late Feb - Mar
Long-day varieties only; start 10-12 weeks before last frost, transplant mid-May.
Late Feb - Mar
Slow to size up; needs the longest possible season.
Mar
Start 10-12 weeks early; transplant after frost danger passes.
Mar
Long-season root; start indoors with celery.
Mar - Early Apr
Start 8-10 weeks before last frost; choose early, short-season varieties.
Mar - Early Apr
Needs bottom heat; pick the earliest cultivars for zone 3.
Late Mar - Apr
Start 6-8 weeks early; favor early determinate/short-season types (e.g. 55-65 day).
Late Mar - Apr
Start with tomatoes; plant at least two for pollination.
Late Mar - Apr
Treat like tomatillo; reliable in short seasons once established.
Late Mar - Apr
Start indoors, transplant early May; tolerates light frost.
Late Mar - Apr
Start indoors; keep growth steady to avoid buttoning.
Late Mar - Apr
Hardy transplant; set out early-to-mid May.
Late Mar - Apr
Long-season; start early so sprouts size up before hard fall frost.
Apr
Can also be direct-sown; transplants give an earlier crop.
Apr
Transplant after frost to reduce bolting risk.
Apr
Very frost-tender; hold indoors until soil and nights warm (June).
Mar - Apr
Slow to germinate; start early or direct-sow late April.
Mar - Apr
Cold-hardy; transplant early and it shrugs off light frost.
Late Apr - Early May
Sow as soon as soil is workable; tolerates frost.
Late Apr - Early May
Very cold-tolerant; one of the earliest sowings.
Late Apr - Early May
Likes cool weather; sow early before heat.
Late Apr - May
Sow early; bolts fast once days lengthen and warm.
Late Apr - May
Succession-sow every 2 weeks; very frost-tolerant.
Late Apr - May
Fast cool-season green; bolts in summer heat.
Late Apr - May
Quick, cold-hardy; sow as soon as soil works.
Late Apr - May
Matures in 3-4 weeks; ideal early crop.
Early - Mid May
Sow once soil reaches ~45°F; keep seedbed moist.
Early - Mid May
Cold-tolerant; greens and roots both usable.
Late Apr - May
Fast cool-season root; sow early.
Early - Mid May
Slow germinator; needs full season, sweetens after frost.
Late Apr - May
Extremely cold-hardy; direct-sow or transplant.
Early May
Sow after worst frosts; productive all season.
Early - Mid May
Plant seed potatoes 2-3 weeks before last frost; hill against late frost.
Late Apr - May
Plant sets in early spring for summer harvest.
Late Apr - May
Quick and cold-tolerant; succession-sow.
Late Apr - May
Cool-season; bolts in heat, so sow early and succession.
May
Direct-sow after frost; self-seeds readily.
Late Apr - May
Hardy annual; tolerates cool soil and light frost.
Late Apr - May
Sow early in cool soil; provide support.
Summer is the prime warm-season window, but it is brief and nights stay cool. After the last frost (late May/early June) set out all heat-lovers and keep succession-sowing fast greens and roots; aim to have warm crops well-established by mid-June to beat the early-September frost.
Early - Mid Jun
Transplant only after frost risk passes; use Wall O' Water or row cover early.
Early - Mid Jun
Wait for warm nights (>50°F); black mulch boosts soil heat.
Mid Jun
Most heat-demanding nightshade; cloche or low tunnel helps.
Early - Mid Jun
Plant in pairs for fruit set.
Early - Mid Jun
Sprawling; give room and harvest fallen husks.
Mid Jun
Cold-sensitive; do not set out until nights stay above 50°F.
Early Jun
Direct-sow in warm soil; very productive in short seasons.
Early Jun
Fast-maturing; sow after frost on warm soil.
Early Jun
Choose early types (e.g. acorn, buttercup); may also start indoors in May to gain time.
Early Jun
Pick short-season varieties; start indoors late May for larger types.
Early Jun
Short-season pie pumpkins ripen reliably; cure before storage.
Early - Mid Jun
Warm soil only; row cover speeds early growth.
Early Jun
Choose early/short-season hybrids; sow in blocks for pollination.
Early - Mid Jun
Frost-tender; sow once soil warms; quick to harvest.
Early - Mid Jun
Sow on warm soil with a trellis.
Early - Mid Jun
Pick early-maturing edamame varieties for zone 3.
Early - Mid Jun
Handles cool nights better than common beans; ornamental too.
Mid Jun
Marginal; start indoors May, transplant onto black plastic + tunnel.
Mid Jun
Only short-season icebox types under plastic/tunnel will ripen.
Early - Mid Jun
Heat-loving green; sow after soil warms.
Late May - Jun
Direct-sow; choose shorter-season varieties for seed.
Early - Mid Jun
Frost-tender; start indoors or transplant after last frost.
Early - Mid Jun
Plant after frost; good pest companion.
Early Jun
Easy from direct seed once frost has passed.
Early Jun
Direct-sow after frost; edible flowers and leaves.
Early Jun
Direct-sow; attracts pollinators, self-seeds.
Jun - Jul
Succession-sow heat-tolerant types in part shade through summer.
Jun
Second sowing for fall storage.
Jun
Main storage sowing; harvest after fall frosts for sweetness.
Fall arrives fast, with the first frost typically around mid-September. The season belongs to cold-hardy greens and roots that sweeten in cool weather, plus garlic planting; protect tender survivors with row cover and harvest storage crops before hard freezes.
Late Sep - Oct
Plant cloves 4-6 weeks before ground freezes; mulch heavily for winter.
Late Jul - Aug
Fall sowing; very frost-hardy and can overwinter under mulch.
Late Jul - Aug
Cool-weather flush; cover during early frosts to extend.
Aug
Fast fall green; flavor improves in cool weather.
Aug
Cold-hardy mustard for fall salads.
Aug
Very cold-tolerant rosette green for fall.
Aug
Fall sowing avoids spring bolting; protect from early frost.
Aug
Quick fall crop; sweeter after light frost.
Aug - Early Sep
Fast fall crop; tolerates frost.
Late Jul - Aug
Roots and greens both improve after frost.
Aug - Sep
Extremely cold-hardy; can overwinter under snow.
Aug - Sep
Cold-hardy salad green; overwinters in cold frame.
Winter is not an outdoor growing season in zone 3 — the ground freezes solid and snow cover lasts for months. Work moves indoors: planning the next garden, ordering seed, starting long-season transplants under lights late in the period, and protecting overwintering garlic and perennials under mulch and snow.
Late Feb
Begin long-day onion seedlings indoors under lights for a May transplant.
Late Feb
Start indoors with onions; needs the longest lead time.
Late Feb
Slow grower; sow indoors at winter's end.
Start-indoors, direct-sow, transplant, and harvest windows for every crop in zone 3.
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Notes |
|---|---|---|---|---|---|
| Amaranth (Leaf) | — | Early - Mid Jun | — | — | Heat-loving green; sow after soil warms. |
| Arugula | — | Late Apr - May | — | — | Fast fall green; flavor improves in cool weather. |
| Beet | — | Jun | — | Sep - Oct | Cold-tolerant; greens and roots both usable. |
| Bok Choy / Pak Choi | — | Aug | — | — | Fall sowing avoids spring bolting; protect from early frost. |
| Broccoli | Late Mar - Apr | — | — | — | Start indoors, transplant early May; tolerates light frost. |
| Brussels Sprouts | Late Mar - Apr | — | — | Sep - Oct | Long-season; start early so sprouts size up before hard fall frost. |
| Bush Bean | — | Early - Mid Jun | — | — | Frost-tender; sow once soil warms; quick to harvest. |
| Cabbage | Late Mar - Apr | — | — | Sep - Oct | Hardy transplant; set out early-to-mid May. |
| Carrot | — | Jun | — | Sep - Oct | Sow once soil reaches ~45°F; keep seedbed moist. |
| Cauliflower | Late Mar - Apr | — | — | — | Start indoors; keep growth steady to avoid buttoning. |
| Celeriac | Mar | — | — | — | Long-season root; start indoors with celery. |
| Celery | Mar | — | — | — | Start 10-12 weeks early; transplant after frost danger passes. |
| Claytonia (Miner's Lettuce) | — | Aug - Sep | — | — | Cold-hardy salad green; overwinters in cold frame. |
| Collards | — | — | — | Sep - Oct | — |
| Corn (Sweet) | — | Early Jun | — | — | Choose early/short-season hybrids; sow in blocks for pollination. |
| Cucumber | — | Early - Mid Jun | — | — | Warm soil only; row cover speeds early growth. |
| Edamame (Soybean) | — | Early - Mid Jun | — | — | Pick early-maturing edamame varieties for zone 3. |
| Eggplant | Mar - Early Apr | — | Mid Jun | — | Most heat-demanding nightshade; cloche or low tunnel helps. |
| Fava Bean | — | Late Apr - Early May | — | — | Likes cool weather; sow early before heat. |
| Garden Pea | — | Late Apr - Early May | — | — | Sow as soon as soil is workable; tolerates frost. |
| Garlic | — | — | Late Sep - Oct | — | Plant cloves 4-6 weeks before ground freezes; mulch heavily for winter. |
| Husk-less / Pie Pumpkin | — | Early Jun | — | — | Short-season pie pumpkins ripen reliably; cure before storage. |
| Kale | — | Late Apr - May | — | Sep - Oct | Extremely cold-hardy; direct-sow or transplant. |
| Kohlrabi | Apr | — | — | — | Can also be direct-sown; transplants give an earlier crop. |
| Leek | Late Feb - Mar | — | — | Sep - Oct | Start indoors with onions; needs the longest lead time. |
| Lettuce | — | Late Jul - Aug | — | — | Cool-weather flush; cover during early frosts to extend. |
| Mizuna | — | Aug | — | — | Cold-hardy mustard for fall salads. |
| Mustard Greens | — | Late Apr - May | — | — | Quick fall crop; sweeter after light frost. |
| Napa Cabbage | Apr | — | — | — | Transplant after frost to reduce bolting risk. |
| Onion (Bulb) | Late Feb - Mar | — | — | Sep | Long-day varieties only; start 10-12 weeks before last frost, transplant mid-May. |
| Pac/Corn Salad (Mâche) | — | Aug - Sep | — | Dec - Feb | Extremely cold-hardy; can overwinter under snow. |
| Parsnip | — | Early - Mid May | — | — | Slow germinator; needs full season, sweetens after frost. |
| Pepper (Bell & Hot) | Mar - Early Apr | — | Early - Mid Jun | — | Wait for warm nights (>50°F); black mulch boosts soil heat. |
| Pole Bean | — | Early - Mid Jun | — | — | Sow on warm soil with a trellis. |
| Pole/Runner Bean (Scarlet) | — | Early - Mid Jun | — | — | Handles cool nights better than common beans; ornamental too. |
| Potato | — | — | Early - Mid May | Sep | Plant seed potatoes 2-3 weeks before last frost; hill against late frost. |
| Pumpkin | — | Early Jun | — | — | Pick short-season varieties; start indoors late May for larger types. |
| Radish | — | Late Apr - May | — | — | Fast fall crop; tolerates frost. |
| Rutabaga | — | — | — | Sep - Oct | — |
| Scallion / Green Onion | — | Late Apr - May | — | — | Quick and cold-tolerant; succession-sow. |
| Shallot | — | — | Late Apr - May | — | Plant sets in early spring for summer harvest. |
| Snap / Snow Pea | — | Late Apr - Early May | — | — | Very cold-tolerant; one of the earliest sowings. |
| Spinach | — | Late Jul - Aug | — | — | Fall sowing; very frost-hardy and can overwinter under mulch. |
| Summer Squash | — | Early Jun | — | — | Fast-maturing; sow after frost on warm soil. |
| Swiss Chard | — | Early May | — | — | Sow after worst frosts; productive all season. |
| Tatsoi | — | Aug | — | — | Very cold-tolerant rosette green for fall. |
| Tomatillo | Late Mar - Apr | — | Early - Mid Jun | — | Plant in pairs for fruit set. |
| Tomato | Late Mar - Apr | — | Early - Mid Jun | — | Transplant only after frost risk passes; use Wall O' Water or row cover early. |
| Turnip | — | Late Jul - Aug | — | — | Roots and greens both improve after frost. |
| Winter Squash | — | Early Jun | — | — | Choose early types (e.g. acorn, buttercup); may also start indoors in May to gain time. |
| Zucchini | — | Early Jun | — | — | Direct-sow in warm soil; very productive in short seasons. |
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Notes |
|---|---|---|---|---|---|
| Basil | Apr | — | Mid Jun | — | Cold-sensitive; do not set out until nights stay above 50°F. |
| Cilantro / Coriander | — | Late Apr - May | — | — | Cool-season; bolts in heat, so sow early and succession. |
| Dill | — | May | — | — | Direct-sow after frost; self-seeds readily. |
| Parsley | Mar - Apr | — | — | — | Slow to germinate; start early or direct-sow late April. |
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Notes |
|---|---|---|---|---|---|
| Ground Cherry | Late Mar - Apr | — | Early - Mid Jun | — | Sprawling; give room and harvest fallen husks. |
| Muskmelon / Cantaloupe | — | — | Mid Jun | — | Marginal; start indoors May, transplant onto black plastic + tunnel. |
| Watermelon | — | — | Mid Jun | — | Only short-season icebox types under plastic/tunnel will ripen. |
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Notes |
|---|---|---|---|---|---|
| Borage | — | Early Jun | — | — | Direct-sow; attracts pollinators, self-seeds. |
| Calendula | — | Late Apr - May | — | — | Hardy annual; tolerates cool soil and light frost. |
| Cosmos | — | Early Jun | — | — | Easy from direct seed once frost has passed. |
| Marigold | — | — | Early - Mid Jun | — | Plant after frost; good pest companion. |
| Nasturtium | — | Early Jun | — | — | Direct-sow after frost; edible flowers and leaves. |
| Snapdragon | Mar - Apr | — | — | — | Cold-hardy; transplant early and it shrugs off light frost. |
| Sunflower | — | Late May - Jun | — | — | Direct-sow; choose shorter-season varieties for seed. |
| Sweet Pea | — | Late Apr - May | — | — | Sow early in cool soil; provide support. |
| Zinnia | — | — | Early - Mid Jun | — | Frost-tender; start indoors or transplant after last frost. |
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Sign Up FreeIn zone 3, spring planting includes Onion (Bulb), Leek, Celery, Celeriac, Pepper (Bell & Hot), Eggplant, Tomato, Tomatillo, and more. See the spring section above for each crop's timing.
The average last spring frost date for USDA zone 3 is May 25. The first fall frost typically arrives around Sep 12, giving a growing season of approximately 105 days.
In zone 3, start crops like Onion (Bulb) indoors around Late Feb - Mar. Check the seasonal sections above for each crop's indoor-sowing window.
Fall planting in zone 3 includes Garlic, Spinach, Lettuce, Arugula, Mizuna, Tatsoi, Bok Choy / Pak Choi, Mustard Greens, and more.
Zone 3 has an average growing season of 105 days, from the last spring frost around May 25 to the first fall frost around Sep 12.
Month-specific guides for zone 3, hand-tuned to current frost dates and crop windows.
Learn more: When to plant vegetables by zone