When to plant in Bolingbrook, IL
USDA Zone 6aBolingbrook, Illinois frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
In zone 6a, Bolingbrook gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
ROMEOVILLE WFO · 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 Bolingbrook’s own odds, recorded at ROMEOVILLE WFO.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 17 | May 1 | Apr 17 | Sep 28 | Oct 12 | Oct 24 |
| 32°F | May 6 | Apr 20 | Apr 7 | Oct 7 | Oct 22 | Nov 3 |
| 28°F | Apr 23 | Apr 8 | Mar 27 | Oct 19 | Nov 1 | Nov 15 |
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 Bolingbrook, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 14 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.
Bolingbrook planting FAQ
When is the last spring frost in Bolingbrook, IL?
Plan for the last spring frost in Bolingbrook around April 20 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Bolingbrook, IL?
The first fall frost in Bolingbrook typically arrives around October 22 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Bolingbrook in?
Bolingbrook is in USDA hardiness zone 6a. In zone 6a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Bolingbrook?
Bolingbrook has about 185 frost-free days — a moderate growing season — between the average last spring frost (April 20) and first fall frost (October 22).
When should I plant tomatoes in Bolingbrook?
For Bolingbrook, sow tomatoes indoors about February 23–March 9 and move the seedlings out around April 27, after the last spring frost.
Never miss a window in Bolingbrook
An email when it’s time to start seeds, transplant, and sow — timed to Bolingbrook’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Romeoville · 7 km
- Woodridge · 8 km
- Naperville · 8 km
- Lemont · 10 km
- Lisle · 12 km
- Darien · 12 km
- Lockport · 12 km
- Plainfield · 13 km
Frost dates recorded at ROMEOVILLE WFO, 9 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 Bolingbrook, IL — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00117457. Retrieved from https://blissgarden.com/illinois/bolingbrook.