When to plant in Hazelwood, MO
USDA Zone 7aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Hazelwood, Missouri — all computed from Hazelwood's nearest NOAA weather station.
In zone 7a, Hazelwood supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
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 Hazelwood’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 Hazelwood, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 15 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.
Hazelwood planting FAQ
When is the last spring frost in Hazelwood, MO?
Plan for the last spring frost in Hazelwood around April 2 (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 Hazelwood, MO?
Expect Hazelwood'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 Hazelwood in?
Hazelwood 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 Hazelwood?
Hazelwood has about 216 frost-free days — a long growing season — between the average last spring frost (April 2) and first fall frost (November 4).
When should I plant tomatoes in Hazelwood?
For Hazelwood, sow tomatoes indoors about February 5–February 19 and move the seedlings out around April 9, after the last spring frost.
Never miss a window in Hazelwood
An email when it’s time to start seeds, transplant, and sow — timed to Hazelwood’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Bridgeton · 3 km
- Florissant · 6 km
- St. Ann · 8 km
- Ferguson · 10 km
- St. Charles · 10 km
- Old Jamestown · 11 km
- Maryland Heights · 11 km
- Overland · 11 km
Frost dates recorded at ST LOUIS LAMBERT INTL AP, 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 Hazelwood, MO — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00013994. Retrieved from https://blissgarden.com/missouri/hazelwood.