When to plant in Chesterfield, MO
USDA Zone 7aChesterfield, Missouri frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Zone 7a means many perennials and even some tender shrubs overwinter in Chesterfield, while your frost dates still decide when annuals go out.
Frost probability
ST CHARLES 7 SSW · 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 Chesterfield’s own odds, recorded at ST CHARLES 7 SSW.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 1 | Apr 16 | Apr 3 | Oct 5 | Oct 19 | Oct 31 |
| 32°F | Apr 21 | Apr 4 | Mar 20 | Oct 15 | Oct 29 | Nov 11 |
| 28°F | Apr 8 | Mar 25 | Mar 8 | Oct 27 | Nov 8 | Nov 27 |
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 Chesterfield, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 10 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.
Chesterfield planting FAQ
When is the last spring frost in Chesterfield, MO?
Chesterfield's average last spring frost falls near April 4 — 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 Chesterfield, MO?
The first fall frost in Chesterfield typically arrives around October 29 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Chesterfield in?
Chesterfield 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 Chesterfield?
There are roughly 208 frost-free days in Chesterfield (a moderate growing season), running from the average last frost around April 4 to the first fall frost near October 29.
When should I plant tomatoes in Chesterfield?
In Chesterfield, start tomato seeds indoors around February 7–February 21, then transplant seedlings outdoors around April 11 once the danger of frost has passed.
Never miss a window in Chesterfield
An email when it’s time to start seeds, transplant, and sow — timed to Chesterfield’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Ballwin · 7 km
- Ellisville · 8 km
- Town and Country · 9 km
- Manchester · 10 km
- Maryland Heights · 11 km
- Creve Coeur · 12 km
- Wildwood · 12 km
- St. Peters · 14 km
Frost dates recorded at ST CHARLES 7 SSW, 5 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 Chesterfield, MO — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00237398. Retrieved from https://blissgarden.com/missouri/chesterfield.