When to plant in Kirkwood, MO
USDA Zone 7aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Kirkwood, Missouri — all computed from Kirkwood's nearest NOAA weather station.
Zone 7a means many perennials and even some tender shrubs overwinter in Kirkwood, while your frost dates still decide when annuals go out.
Frost probability
ST LOUIS SCI CTR · 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 Kirkwood’s own odds, recorded at ST LOUIS SCI CTR.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 27 | Apr 12 | Mar 27 | Oct 15 | Oct 26 | Nov 7 |
| 32°F | Apr 18 | Apr 1 | Mar 14 | Oct 24 | Nov 4 | Nov 21 |
| 28°F | Apr 7 | Mar 22 | Mar 5 | Nov 2 | Nov 15 | Dec 4 |
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 Kirkwood, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 20 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.
Kirkwood planting FAQ
When is the last spring frost in Kirkwood, MO?
Kirkwood's average last spring frost falls near April 1 — 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 Kirkwood, MO?
Expect Kirkwood's first fall frost near November 4 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Kirkwood in?
Kirkwood 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 Kirkwood?
There are roughly 217 frost-free days in Kirkwood (a long growing season), running from the average last frost around April 1 to the first fall frost near November 4.
When should I plant tomatoes in Kirkwood?
In Kirkwood, start tomato seeds indoors around February 4–February 18, then transplant seedlings outdoors around April 8 once the danger of frost has passed.
Never miss a window in Kirkwood
An email when it’s time to start seeds, transplant, and sow — timed to Kirkwood’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Crestwood · 4 km
- Webster Groves · 6 km
- Manchester · 7 km
- Town and Country · 8 km
- Affton · 9 km
- Creve Coeur · 9 km
- Concord · 10 km
- Clayton · 11 km
Frost dates recorded at ST LOUIS SCI CTR, 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 Kirkwood, MO — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00237452. Retrieved from https://blissgarden.com/missouri/kirkwood.