June · USDA Zone 3
summerWhat to plant in June in USDA zone 3
Summer planting guide for zone 3 (Northern Minnesota, North Dakota, interior Alaska) — a 110-day growing season with last frost around late May and first frost around early September.
Sow outdoors in June — zone 3
Direct-sow these seeds into prepared garden beds or large containers. Soil temperature matters more than the calendar date — wait for a sustained warm-up before sowing tender crops.
- Beans, cucumbers, squash, corn
- Carrots, beets, lettuce, chard succession
Transplant in June — zone 3
Move hardened-off seedlings into the garden. Tender crops want soil above 16 °C and night temperatures consistently above 10 °C; cool-season transplants tolerate light frost.
Harvest in June — zone 3
These crops should be ready or in active harvest in June for zone 3 gardens. Pick fruiting crops every 2-3 days to keep production going.
- Asparagus, rhubarb, spring radishes
Universal June tasks
These apply across most US and UK gardens in June, regardless of zone.
- Mulch all warm-season beds — straw, shredded leaves, or grass clippings.
- Water deeply once or twice a week instead of light daily sprinkles.
- Stake, prune, and tie up tomatoes; remove suckers on indeterminate varieties.
- Start succession sowing — bush beans, lettuce, radishes every 2-3 weeks.
- Watch for pests: aphids, flea beetles, squash bugs, cabbage moths.
- Harvest garlic scapes (hardneck varieties) in zones 5-8.
Why this works for zone 3
Zone 3 has average annual minimum temperatures of -40 to -30°F (-40 to -34°C) and a frost-free window from late May to early September — about 110 growing days. Frost-tender vegetables need row covers and short-season varieties. Heat-loving crops (peppers, eggplant) require greenhouses or season extension.
Dates are zone-wide averages. Local microclimates (south-facing slopes, urban heat, lakeside warmth, elevation) can shift the window by 1-2 weeks within the same zone.
UK gardeners — June
June is the UK's sowing-and-harvesting overlap. Direct-sow French beans, runner beans, courgettes, sweetcorn, salad leaves, carrots, and beetroot. Harvest strawberries, broad beans, peas, early potatoes, and salad. Plant out leeks and brassicas.
Source and methodology
Frost-date averages from NOAA Climate Data Online within USDA zone 3. Hardiness boundaries from the USDA Plant Hardiness Zone Map (2023). Crop timing curated against US Cooperative Extension Service publications (UNL, UMN, NC State, Texas A&M, UF/IFAS, Oregon State) and cross-referenced against the RHS sowing calendar. Curated by the Growli editorial team.
Keep going
- ← May in zone 3
- July in zone 3 →
- All zones — what to plant in June
- USDA Zone 3 — frost dates and crop list
- Full 12-month planting calendar