When to plant in Edwardsville, IL
USDA Zone 7aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Edwardsville, Illinois — all computed from Edwardsville's nearest NOAA weather station.
These dates come from a station roughly 16 km away, the closest with full normals; terrain around Edwardsville (elevation, water, pavement) can move your real frost dates a few days either way. In zone 7a, Edwardsville supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
ALTON - MELVIN PRICE L&D · 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 Edwardsville’s own odds, recorded at ALTON - MELVIN PRICE L&D.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 1 | Apr 14 | Mar 31 | Oct 12 | Oct 27 | Nov 8 |
| 32°F | Apr 19 | Apr 4 | Mar 18 | Oct 25 | Nov 5 | Nov 21 |
| 28°F | Apr 9 | Mar 25 | Mar 6 | Nov 2 | Nov 16 | Dec 1 |
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 Edwardsville, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 30 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.
Edwardsville planting FAQ
When is the last spring frost in Edwardsville, IL?
Plan for the last spring frost in Edwardsville around April 4 (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 Edwardsville, IL?
The first fall frost in Edwardsville typically arrives around November 5 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Edwardsville in?
Edwardsville is in USDA hardiness zone 7a. In zone 7a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Edwardsville?
Edwardsville has about 215 frost-free days — a long growing season — between the average last spring frost (April 4) and first fall frost (November 5).
When should I plant tomatoes in Edwardsville?
For Edwardsville, sow tomatoes indoors about February 7–February 21 and move the seedlings out around April 11, after the last spring frost.
Never miss a window in Edwardsville
An email when it’s time to start seeds, transplant, and sow — timed to Edwardsville’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Glen Carbon · 4 km
- Troy · 11 km
- Wood River · 11 km
- Collinsville · 13 km
- Granite City · 14 km
- Alton · 19 km
- Spanish Lake · 19 km
- Bellefontaine Neighbors · 21 km
Frost dates recorded at ALTON - MELVIN PRICE L&D, 16 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 Edwardsville, IL — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00110137. Retrieved from https://blissgarden.com/illinois/edwardsville.