Illinois planting calendar

When to plant edamame in Illinois — sow, transplant & harvest dates

Illinois is mostly USDA zone 6a (range 5a-7a). Dates below are derived from edamame's frost tolerance and Illinois's frost window — not generic national averages.

Edamame planting timetable for Illinois

Stage	When in Illinois	Anchor
Direct-sow outside	early May (May 9)	14 days after the last frost (late April)
First harvest (estimate)	late July (July 28)	~80 days from direct sow

Dates are state-wide averages for the dominant zone. Local microclimates — elevation, urban heat, coastal moderation — can shift the window by 1-2 weeks. Use the frost-date calculator for a date tuned to your town.

Why Illinois's climate shifts the edamame dates

Illinois's last spring frost averages late April and first fall frost mid-October, which sets the whole planting clock. Illinois has a productive continental Midwest climate. The south of the state runs nearly two half-zones warmer than the Chicago area. Wait for warm soil — edamame stall in cold ground even after the air warms, so don't rush them out.

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.

Frost-risk note

Don't plant before late April — even a light frost will kill seedlings overnight. In the northern counties near the Wisconsin line (zone 5a) the safe date runs a week or two later.

Regional variation within Illinois

the northern counties near the Wisconsin line (zone 5a) runs roughly 1-2 weeks behind the state average; the far south near Cairo and Carbondale (zone 7a) can plant 1-2 weeks earlier.

Chicago — USDA zone 6a
Springfield — USDA zone 6a
Peoria — USDA zone 5b
Rockford — USDA zone 5b
Carbondale — USDA zone 7a

What else to plant in Illinois around then

Pair the post-frost slot with other warm-season crops — peppers, beans, squash, and cucumbers.

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: ~80 days from planting out.

Frequently asked questions

When is the best time to plant edamame in Illinois?

In Illinois (mostly USDA zone 6a), direct-sow edamame early May (after the last frost, late April), and harvest from late July. Edamame are frost-tender — a single light frost kills seedlings, so they only go outside once frost danger has fully passed and the soil is warm.

What USDA zone is Illinois?

Most of Illinois sits in USDA hardiness zone 6a, with the state spanning roughly 5a-7a from the northern counties near the Wisconsin line (zone 5a) to the far south near Cairo and Carbondale (zone 7a). The last spring frost averages late April and the first fall frost mid-October.

Can you grow edamame in Illinois?

Yes. Illinois's dominant zone 6a supports edamame — the key is timing. Edamame are frost-tender — a single light frost kills seedlings, so they only go outside once frost danger has fully passed and the soil is warm.

Does the planting date change across Illinois?

the northern counties near the Wisconsin line (zone 5a) runs roughly 1-2 weeks behind the state average; the far south near Cairo and Carbondale (zone 7a) can plant 1-2 weeks earlier.

What else can I plant in Illinois around the same time?

Pair the post-frost slot with other warm-season crops — peppers, beans, squash, and cucumbers.

Source and methodology

State zone spans from the USDA Plant Hardiness Zone Map (2023); frost-date averages from NOAA Climate Data Online. Hot-state two-season timing cross-checked against the UF/IFAS Florida Gardening Calendar and the University of Arizona Cooperative Extension planting calendar. Curated by the Growli editorial team.