When to plant in Florissant, MO
USDA Zone 7aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Florissant, Missouri — all computed from Florissant's nearest NOAA weather station.
Zone 7a means many perennials and even some tender shrubs overwinter in Florissant, while your frost dates still decide when annuals go out.
Frost probability
ST LOUIS LAMBERT INTL 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 Florissant’s own odds, recorded at ST LOUIS LAMBERT INTL AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 28 | Apr 13 | Mar 31 | Oct 14 | Oct 26 | Nov 6 |
| 32°F | Apr 17 | Apr 2 | Mar 17 | Oct 23 | Nov 4 | Nov 18 |
| 28°F | Apr 7 | Mar 23 | Mar 5 | Nov 2 | Nov 13 | Nov 30 |
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 Florissant, 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.
Florissant planting FAQ
When is the last spring frost in Florissant, MO?
Florissant's average last spring frost falls near April 2 — 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 Florissant, MO?
In Florissant, the first 32°F freeze of fall lands around November 4 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Florissant in?
Florissant 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 Florissant?
There are roughly 216 frost-free days in Florissant (a long growing season), running from the average last frost around April 2 to the first fall frost near November 4.
When should I plant tomatoes in Florissant?
In Florissant, start tomato seeds indoors around February 5–February 19, then transplant seedlings outdoors around April 9 once the danger of frost has passed.
Never miss a window in Florissant
An email when it’s time to start seeds, transplant, and sow — timed to Florissant’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Old Jamestown · 5 km
- Hazelwood · 6 km
- Ferguson · 6 km
- Bridgeton · 8 km
- St. Ann · 10 km
- Bellefontaine Neighbors · 10 km
- Jennings · 10 km
- Spanish Lake · 10 km
Frost dates recorded at ST LOUIS LAMBERT INTL AP, 7 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 Florissant, MO — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00013994. Retrieved from https://blissgarden.com/missouri/florissant.