USDA Zone 2 planting calendar
When to plant edamame in USDA zone 2
Sowing, transplant, and harvest dates calibrated to zone 2's 90-day season (Northern Alaska, parts of northern Canada).
Key dates for edamame in zone 2
| Stage | When | Anchor |
|---|---|---|
| Direct sow outdoors | mid-June (June 19) | 14 days after last frost (early June) |
| First harvest (estimate) | early September (September 7) | ~80 days from sow |
Dates are zone-wide averages. Local microclimates (south-facing slopes, urban heat, lakeside warmth, elevation) can shift the planting window by 1-2 weeks within the same zone.
Why this timing works for zone 2
Zone 2 has average annual minimum temperatures of -50 to -40°F and a 90-day frost-free window from early June to late August. Edamame are tender — they need soil above 16 °C to grow and stop fruiting once nights drop below 10 °C. That puts the safe outdoor planting window after the last spring frost passes, and the harvest closes when fall temperatures arrive.
Direct sow after last frost when soil is at least 60 °F (16 °C); seeds rot readily in cold, wet soil. Harvest at the edamame (green-pod) stage 75–90 days from sowing, when pods are plump and bright green — the window is only 5–7 days before beans mature to dry soybeans. Zones 3–4 should select fast-maturing varieties (≤80 days) and use black plastic mulch to warm soil; zones 9–11 can make a second sowing in late summer for fall harvest.
Quick-grow guide
- Sun: Full sun — 6+ hours direct.
- Soil temperature for germination: 16–35 °C (60–95 °F); optimal 21–32 °C (70–90 °F).
- Spacing: 6 inches (15 cm) plants; 18–24 inches (45–60 cm) between rows between plants.
- Days to harvest from direct sow: ~80 days.
- Wait until night temperatures stay above 10 °C — cold soil stunts warm-season crops permanently.
Common mistakes — zone 2 × edamame
- Skipping indoor seed-starting: zone 2's 90-day season is too short for edamame from direct sow — you need transplants 6+ weeks ahead of last frost.
- Moving transplants out before soil hits 16 °C — cold roots stall growth for weeks even after the air warms up.
Source and methodology
Frost-date averages from NOAA Climate Data Online within each USDA hardiness zone. Hardiness zone boundaries from the USDA Plant Hardiness Zone Map (2023). Crop timing offsets calibrated against US Cooperative Extension Service publications (UNL, UMN, NC State, Texas A&M, UF/IFAS) and cross-checked against the RHS sowing calendar for en-GB readers. Curated by the Growli editorial team.
Keep going
- How to grow edamame — full guide
- USDA Zone 2 — frost dates and what else to plant
- All 13 USDA hardiness zones