When to plant in Geneva, IL
USDA Zone 5bEverything below — frost dates, hardiness zone, and what to plant when in Geneva, Illinois — is derived from the closest NOAA station with complete climate normals.
Zone 5b means Geneva sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
WEST CHICAGO DUPAGE AP · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Geneva’s own odds, recorded at WEST CHICAGO DUPAGE AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 24 | May 6 | Apr 23 | Sep 25 | Oct 7 | Oct 20 |
| 32°F | May 12 | Apr 25 | Apr 11 | Oct 5 | Oct 19 | Oct 30 |
| 28°F | Apr 29 | Apr 14 | Mar 31 | Oct 16 | Oct 29 | Nov 12 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Geneva, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 18 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Geneva planting FAQ
When is the last spring frost in Geneva, IL?
On average, the last spring frost in Geneva is around April 25 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Geneva, IL?
In Geneva, the first 32°F freeze of fall lands around October 19 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Geneva in?
Geneva is in USDA hardiness zone 5b. In zone 5b, winters are cold — pick cold-hardy varieties and protect tender crops.
How long is the growing season in Geneva?
There are roughly 177 frost-free days in Geneva (a moderate growing season), running from the average last frost around April 25 to the first fall frost near October 19.
When should I plant tomatoes in Geneva?
In Geneva, start tomato seeds indoors around February 28–March 14, then transplant seedlings outdoors around May 2 once the danger of frost has passed.
Never miss a window in Geneva
An email when it’s time to start seeds, transplant, and sow — timed to Geneva’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Batavia · 4 km
- St. Charles · 4 km
- North Aurora · 8 km
- West Chicago · 9 km
- Campton Hills · 10 km
- South Elgin · 12 km
- Warrenville · 14 km
- Aurora · 14 km
Frost dates recorded at WEST CHICAGO DUPAGE AP, 8 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Geneva, IL — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00094892. Retrieved from https://blissgarden.com/illinois/geneva.