When to plant in Maryland Heights, MO
USDA Zone 7aMaryland Heights, Missouri frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
In zone 7a, Maryland Heights supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
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 Maryland Heights’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 Maryland Heights, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 11 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.
Maryland Heights planting FAQ
When is the last spring frost in Maryland Heights, MO?
Plan for the last spring frost in Maryland Heights around April 4 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Maryland Heights, MO?
In Maryland Heights, the first 32°F freeze of fall lands around October 29 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Maryland Heights in?
Maryland 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 Maryland Heights?
Maryland Heights has about 208 frost-free days — a moderate growing season — between the average last spring frost (April 4) and first fall frost (October 29).
When should I plant tomatoes in Maryland Heights?
For Maryland Heights, sow tomatoes indoors about February 7–February 21 and move the seedlings out around April 11, after the last spring frost.
Never miss a window in Maryland Heights
An email when it’s time to start seeds, transplant, and sow — timed to Maryland Heights’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Creve Coeur · 7 km
- St. Ann · 7 km
- Bridgeton · 8 km
- Overland · 9 km
- St. Charles · 10 km
- Town and Country · 10 km
- Hazelwood · 11 km
- Chesterfield · 11 km
Frost dates recorded at ST CHARLES 7 SSW, 6 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 Maryland Heights, MO — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00237398. Retrieved from https://blissgarden.com/missouri/maryland-heights.