USDA Zone 5 · Cool — late springs, frost into May
Zone 5 April Planting Guide
April in USDA Zone 5 brings unpredictable late frosts, so focus on cold-hardy crops and indoor seed starting rather than rushing tender plants outside. Soil temperatures are slowly rising, giving you a strategic window to get a head start on the season.
🌱 Plant now
Peas
Direct sow as soon as soil is workable; they thrive in cool temps and tolerate light frost.
Lettuce
Start transplants outdoors under a cold frame or row cover for frost protection through mid-May.
Spinach
Direct sow outdoors now; spinach germinates in near-freezing soil and bolts later in heat.
Onion Sets
Plant sets 1 inch deep as soon as soil is workable for a strong early bulb development.
Tomatoes (indoors)
Start seeds indoors 6–8 weeks before last frost so transplants are ready for late May.
🚫 Avoid this month
Basil
Highly frost-sensitive and stunted by cold soil; wait until nighttime temps stay above 50°F.
Cucumbers
Seeds rot in cold soil and seedlings are killed by frost; direct sow only after May 15–20.
Peppers (outdoors)
Need warm soil and air temperatures to thrive; outdoor planting before late May risks cold stress and poor yields.
🐛 Pest alert
Watch for early aphid colonies on overwintered kale and emerging pea shoots as temperatures warm. Slugs also become active during cool, wet April nights — set out iron phosphate bait traps and check under debris regularly to prevent seedling damage.
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