USDA Zone 5 Planting Guide: What to Grow in Cold Climates
Zone 5 gardeners can grow most vegetables with a 140-160 day growing season, but must start seeds indoors and use season extension techniques. Best crops include cold-hardy varieties: tomatoes, peppers, and squash started indoors 6-8 weeks before last frost; direct-sow beans, corn, and squash after soil warms; and plant cool-season crops like lettuce, peas, and brassicas for spring and fall harvests.
| Vegetable | When to Plant | Notes |
|---|---|---|
| Tomatoes | Start indoors 6-8 weeks before last frost; transplant after last frost | Choose early-maturing varieties (50-70 days) like Early Girl, Stupice, or 4th of July for reliable harvests |
| Peppers | Start indoors 8-10 weeks before last frost; transplant 2 weeks after last frost | Peppers need warm soil. Use black plastic mulch and row covers for faster growth |
| Zucchini | Direct sow after last frost when soil is 60°F+ | Fast-growing and productive in Zone 5. One of the most reliable summer vegetables |
| Bush Beans | Direct sow 1-2 weeks after last frost; succession plant every 2-3 weeks | Quick 50-60 day harvest. Plant succession crops through mid-July for continuous harvest |
| Lettuce | Direct sow as soon as soil can be worked; fall crops in August | Thrives in cool Zone 5 springs and falls. Provide shade in summer to prevent bolting |
| Broccoli | Start indoors 6 weeks before last frost; fall crop started in June | Excellent cool-season crop for Zone 5. Fall harvests are often better quality than spring |
Plant bare-root in early spring as soon as soil can be worked
June-bearing and day-neutral varieties both thrive. Mulch heavily in winter
Plant bare-root in early spring or fall
Very cold-hardy. Fall-bearing varieties like Heritage produce before frost
Plant in spring after last frost
Choose northern highbush varieties rated to Zone 4-5. Provide acidic soil
Start indoors 6 weeks before last frost; transplant after frost danger
Frost-sensitive annual. Harvest frequently to prolong production until first fall frost
Direct sow in early spring; tolerates light frost
Biennial that often overwinters in Zone 5 with mulch protection
Direct sow in early spring and late summer
Bolts quickly in summer heat. Best planted for spring and fall harvests
Short Growing Season
Start warm-season crops indoors 6-10 weeks before last frost. Use row covers, cold frames, and black plastic mulch to warm soil faster. Choose early-maturing varieties with shorter days-to-maturity.
Late Spring Frosts
Wait to transplant tender crops until after last frost date. Keep row covers handy for unexpected cold snaps. Harden off seedlings gradually over 1-2 weeks.
Early Fall Frosts
Cover crops with frost blankets when frost threatens. Harvest tender crops before first frost. Focus fall garden on cold-hardy greens and brassicas.
Soil Takes Time to Warm
Use raised beds which warm faster. Apply black plastic mulch 2-3 weeks before planting. Use clear plastic to solarize and warm soil in early spring.
February
- •Order seeds if not done in January
- •Start onions, leeks, and celery indoors under lights
- •Check stored vegetables and remove any rotting items
March
- •Start tomatoes, peppers, and eggplants indoors (6-8 weeks before last frost)
- •Start broccoli, cabbage, and cauliflower indoors
- •Prune fruit trees and berry bushes before buds break
April
- •Prepare beds as soon as soil is workable
- •Direct sow peas, lettuce, spinach, and radishes
- •Transplant hardened-off onion sets and brassica seedlings
- •Apply compost to garden beds
May
- •After last frost: transplant tomatoes, peppers, and warm-season crops
- •Direct sow beans, corn, squash, and cucumbers after soil warms
- •Mulch around transplants
- •Set up drip irrigation if used
June
- •Succession plant beans and lettuce
- •Start fall brassica seeds indoors
- •Harvest spring-planted peas and greens
- •Side-dress heavy feeders with compost or fertilizer
July
- •Continue harvesting summer crops
- •Plant fall brassica transplants
- •Last succession planting of beans (early July)
- •Keep up with watering during summer heat
August
- •Direct sow fall lettuce, spinach, and radishes
- •Begin harvesting tomatoes, peppers, and summer squash
- •Order garlic for fall planting
- •Clean up finished crops
September
- •Harvest main crop tomatoes and peppers before frost
- •Plant garlic (2-4 weeks before ground freezes)
- •Cover tender crops when frost threatens
- •Continue harvesting cold-hardy greens
October
- •Finish garlic planting
- •Clean up garden after killing frost
- •Mulch garlic and overwintering crops heavily
- •Store root vegetables in cool location
- Choose vegetable varieties bred for short seasons - look for "early" or "short season" in names
- Build raised beds for faster soil warming in spring
- Invest in a soil thermometer - don't plant warm-season crops until soil reaches 60°F
- Use row covers and cold frames to extend the season by 4-6 weeks on each end
- Grow a fall garden - many crops taste better after light frost
- Mulch heavily with straw or leaves after ground freezes to protect perennials
- Keep records of frost dates and harvest times to refine your planting schedule
When should I start tomato seeds indoors in Zone 5?
Start tomato seeds indoors 6-8 weeks before your last frost date. For most Zone 5 areas, this means starting seeds in mid-March for transplanting in mid-May. Don't start too early - overgrown, leggy seedlings don't transplant well.
Can I grow watermelons in Zone 5?
Yes, but choose early-maturing varieties (70-80 days) like Sugar Baby, Blacktail Mountain, or Golden Midget. Start seeds indoors 3-4 weeks before last frost, use black plastic mulch to warm soil, and protect young plants with row covers.
What vegetables can survive frost in Zone 5?
Many vegetables tolerate light frost (28-32°F): lettuce, spinach, kale, collards, Brussels sprouts, carrots, beets, turnips, parsnips, and leeks. Some like kale and Brussels sprouts actually taste sweeter after frost as cold converts starches to sugars.
When is the last frost in Zone 5?
Zone 5 last frost dates typically range from April 15 to May 15, depending on local microclimates. Check your county extension service for specific dates. Higher elevations and valleys may have later frost dates than surrounding areas.