When to plant in Batavia, IL
USDA Zone 5bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Batavia, Illinois — all computed from Batavia's nearest NOAA weather station.
Zone 5b means Batavia sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
AURORA · 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 Batavia’s own odds, recorded at AURORA.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 19 | May 1 | Apr 17 | Sep 29 | Oct 13 | Oct 25 |
| 32°F | May 4 | Apr 19 | Apr 5 | Oct 9 | Oct 23 | Nov 3 |
| 28°F | Apr 23 | Apr 8 | Mar 25 | Oct 21 | Nov 2 | Nov 16 |
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 Batavia, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 17 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.
Batavia planting FAQ
When is the last spring frost in Batavia, IL?
On average, the last spring frost in Batavia is around April 19 (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 Batavia, IL?
Expect Batavia's first fall frost near October 23 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Batavia in?
Batavia 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 Batavia?
There are roughly 187 frost-free days in Batavia (a moderate growing season), running from the average last frost around April 19 to the first fall frost near October 23.
When should I plant tomatoes in Batavia?
In Batavia, start tomato seeds indoors around February 22–March 8, then transplant seedlings outdoors around April 26 once the danger of frost has passed.
Never miss a window in Batavia
An email when it’s time to start seeds, transplant, and sow — timed to Batavia’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Geneva · 4 km
- North Aurora · 5 km
- St. Charles · 8 km
- West Chicago · 9 km
- Aurora · 10 km
- Warrenville · 11 km
- Winfield · 14 km
- Campton Hills · 14 km
Frost dates recorded at AURORA, 7 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 Batavia, IL — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00110338. Retrieved from https://blissgarden.com/illinois/batavia.