When to plant in Mahomet, IL
USDA Zone 6aMahomet, Illinois frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Heads up: the nearest complete-normals station is about 15 km from Mahomet, so your yard's frost dates can differ — a low spot or a paved city center can shift them by a week. In zone 6a, Mahomet gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
CHAMPAIGN 9 SW · 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 Mahomet’s own odds, recorded at CHAMPAIGN 9 SW.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 22 | May 4 | Apr 20 | Sep 20 | Oct 3 | Oct 16 |
| 32°F | May 9 | Apr 23 | Apr 9 | Sep 28 | Oct 13 | Oct 25 |
| 28°F | Apr 28 | Apr 11 | Mar 29 | Oct 8 | Oct 23 | Nov 4 |
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 Mahomet, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 19 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.
Mahomet planting FAQ
When is the last spring frost in Mahomet, IL?
On average, the last spring frost in Mahomet is around April 23 (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 Mahomet, IL?
In Mahomet, the first 32°F freeze of fall lands around October 13 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Mahomet in?
Mahomet 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 Mahomet?
Mahomet has about 173 frost-free days — a moderate growing season — between the average last spring frost (April 23) and first fall frost (October 13).
When should I plant tomatoes in Mahomet?
For Mahomet, sow tomatoes indoors about February 26–March 12 and move the seedlings out around April 30, after the last spring frost.
Never miss a window in Mahomet
An email when it’s time to start seeds, transplant, and sow — timed to Mahomet’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at CHAMPAIGN 9 SW, 15 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 Mahomet, IL — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00054808. Retrieved from https://blissgarden.com/illinois/mahomet.