When to plant in Mehlville, MO
USDA Zone 7aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Mehlville, Missouri — all computed from Mehlville's nearest NOAA weather station.
Zone 7a means many perennials and even some tender shrubs overwinter in Mehlville, while your frost dates still decide when annuals go out.
Frost probability
CAHOKIA · 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 Mehlville’s own odds, recorded at CAHOKIA.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 3 | Apr 18 | Apr 4 | Oct 5 | Oct 18 | Oct 28 |
| 32°F | Apr 20 | Apr 6 | Mar 22 | Oct 14 | Oct 27 | Nov 7 |
| 28°F | Apr 10 | Mar 27 | Mar 11 | Oct 25 | Nov 5 | Nov 23 |
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 Mehlville, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 16 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.
Mehlville planting FAQ
When is the last spring frost in Mehlville, MO?
Mehlville's average last spring frost falls near April 6 — 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 Mehlville, MO?
In Mehlville, the first 32°F freeze of fall lands around October 27 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Mehlville in?
Mehlville 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 Mehlville?
There are roughly 204 frost-free days in Mehlville (a moderate growing season), running from the average last frost around April 6 to the first fall frost near October 27.
When should I plant tomatoes in Mehlville?
In Mehlville, start tomato seeds indoors around February 9–February 23, then transplant seedlings outdoors around April 13 once the danger of frost has passed.
Never miss a window in Mehlville
An email when it’s time to start seeds, transplant, and sow — timed to Mehlville’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at CAHOKIA, 13 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 Mehlville, MO — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00111160. Retrieved from https://blissgarden.com/missouri/mehlville.