When to plant in Rantoul, IL
USDA Zone 6aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Rantoul, Illinois — all computed from Rantoul's nearest NOAA weather station.
In zone 6a, Rantoul gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
RANTOUL · 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 Rantoul’s own odds, recorded at RANTOUL.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 17 | Apr 30 | Apr 18 | Sep 26 | Oct 8 | Oct 20 |
| 32°F | May 6 | Apr 21 | Apr 7 | Oct 5 | Oct 18 | Oct 31 |
| 28°F | Apr 26 | Apr 10 | Mar 30 | 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 Rantoul, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 25 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.
Rantoul planting FAQ
When is the last spring frost in Rantoul, IL?
Plan for the last spring frost in Rantoul around April 21 (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 Rantoul, IL?
In Rantoul, the first 32°F freeze of fall lands around October 18 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Rantoul in?
Rantoul 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 Rantoul?
Rantoul has about 180 frost-free days — a moderate growing season — between the average last spring frost (April 21) and first fall frost (October 18).
When should I plant tomatoes in Rantoul?
For Rantoul, sow tomatoes indoors about February 24–March 10 and move the seedlings out around April 28, after the last spring frost.
Never miss a window in Rantoul
An email when it’s time to start seeds, transplant, and sow — timed to Rantoul’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at RANTOUL, 1 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 Rantoul, IL — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00014806. Retrieved from https://blissgarden.com/illinois/rantoul.