When to plant in Fairview Heights, IL
USDA Zone 7aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Fairview Heights, Illinois — all computed from Fairview Heights's nearest NOAA weather station.
Zone 7a means many perennials and even some tender shrubs overwinter in Fairview Heights, while your frost dates still decide when annuals go out.
Frost probability
CAHOKIA ST LOUIS AP · 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 Fairview Heights’s own odds, recorded at CAHOKIA ST LOUIS AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 4 | Apr 19 | Apr 4 | Oct 3 | Oct 17 | Oct 28 |
| 32°F | Apr 23 | Apr 8 | Mar 23 | Oct 12 | Oct 26 | Nov 7 |
| 28°F | Apr 12 | Mar 28 | Mar 10 | Oct 24 | Nov 6 | Nov 24 |
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 Fairview Heights, 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.
Fairview Heights planting FAQ
When is the last spring frost in Fairview Heights, IL?
Fairview Heights's average last spring frost falls near April 8 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Fairview Heights, IL?
The first fall frost in Fairview Heights typically arrives around October 26 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Fairview Heights in?
Fairview Heights 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 Fairview Heights?
There are roughly 201 frost-free days in Fairview Heights (a moderate growing season), running from the average last frost around April 8 to the first fall frost near October 26.
When should I plant tomatoes in Fairview Heights?
In Fairview Heights, start tomato seeds indoors around February 11–February 25, then transplant seedlings outdoors around April 15 once the danger of frost has passed.
Never miss a window in Fairview Heights
An email when it’s time to start seeds, transplant, and sow — timed to Fairview Heights’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Swansea · 5 km
- O'Fallon · 8 km
- Belleville · 9 km
- Collinsville · 9 km
- Shiloh · 9 km
- East St. Louis · 11 km
- Cahokia Heights · 13 km
- Troy · 17 km
Frost dates recorded at CAHOKIA ST LOUIS AP, 14 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 Fairview Heights, IL — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00003960. Retrieved from https://blissgarden.com/illinois/fairview-heights.