USDA Zone 3 · Cold — short, cool summers
Zone 3 April Planting Guide
April in USDA Zone 3 means the ground is just beginning to thaw, with overnight frosts still common and last frost dates often extending into late May. Focus on cold-hardy starts indoors and a few frost-tolerant direct-sow crops as soil becomes workable.
🌱 Plant now
Onions (from seed or sets)
Start seeds indoors under grow lights 10–12 weeks before last frost for a strong head start.
Kale
Direct sow or transplant into the garden in late April — kale tolerates light frost and even improves in flavor after a freeze.
Peas
Sow directly as soon as soil is workable at 45°F; peas prefer cool roots and will stall in heat.
Tomatoes (indoors)
Start tomato seeds indoors now so transplants are ready after the last frost around late May to early June.
Spinach
Direct sow spinach in early April — it germinates in near-freezing soil and bolts quickly once summer heat arrives.
🚫 Avoid this month
Basil
Basil is highly frost-sensitive and suffers cold damage below 50°F; wait until June to plant outdoors in Zone 3.
Cucumbers
Cucumbers need warm soil (60°F+) and no frost risk — transplanting in April will stunt or kill them.
Melons
Melons require a long, warm growing season and cannot tolerate frost; outdoor planting in April guarantees failure in Zone 3.
🐛 Pest alert
Watch for cutworms as soil thaws in April — these soil-dwelling larvae emerge early and can sever seedlings at the base overnight. Place cardboard or plastic collars around transplants and consider a diatomaceous earth barrier around bed edges as a first line of defense.
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