Illinois planting calendar

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

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

Arugula planting timetable for Illinois

Stage	When in Illinois	Anchor
Direct-sow outside	late March (March 28)	28 days before the last frost (late April)
First harvest (estimate)	early May (May 7)	~40 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 arugula 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. Sow early — arugula bolt once daytime temperatures hold above 24 °C, so the earlier they go in, the longer the harvest.

Arugula is one of the most cold-tolerant salad greens — direct-sow 3-5 weeks before the last spring frost; it germinates reliably in soil as cool as 7 °C and seedlings survive light frost. It bolts quickly once daytime temperatures exceed 24 °C, turning leaves peppery-bitter, so succession-sow every 2 weeks and switch to heat-tolerant varieties (e.g. 'Astro') for late-spring runs. In zones 7–11, grow it as a fall and winter crop instead.

Frost-risk note

Don't plant before late April — a hard freeze can still set young plants back. 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

The same early window suits peas, lettuce, spinach, and onion sets.

Quick-grow guide

Sun: Full sun in cool weather; part shade in warm climates to delay bolting.
Soil temperature for germination: 7-18 °C (45-65 °F).
Spacing: 3-6 inches (8-15 cm) between plants.
Days to harvest: ~40 days from planting out.

Frequently asked questions

When is the best time to plant arugula in Illinois?

In Illinois (mostly USDA zone 6a), direct-sow arugula late March (before the last frost, late April), and harvest from early May. Arugula are cold-hardy — they tolerate frost and actively prefer cool weather, so they go in well before the last spring frost and bolt in summer heat.

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 arugula in Illinois?

Yes. Illinois's dominant zone 6a supports arugula — the key is timing. Arugula are cold-hardy — they tolerate frost and actively prefer cool weather, so they go in well before the last spring frost and bolt in summer heat.

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?

The same early window suits peas, lettuce, spinach, and onion sets.

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.