When to plant in Stillwater, OK
USDA Zone 7aEverything below — frost dates, hardiness zone, and what to plant when in Stillwater, Oklahoma — is derived from the closest NOAA station with complete climate normals.
In zone 7a, Stillwater supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
STILLWATER 2 W · 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 Stillwater’s own odds, recorded at STILLWATER 2 W.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 2 | Apr 17 | Apr 1 | Oct 6 | Oct 22 | Nov 3 |
| 32°F | Apr 21 | Apr 5 | Mar 21 | Oct 16 | Oct 30 | Nov 15 |
| 28°F | Apr 10 | Mar 27 | Mar 6 | Oct 24 | Nov 9 | Nov 25 |
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 Stillwater, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 2 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.
Stillwater planting FAQ
When is the last spring frost in Stillwater, OK?
Stillwater's average last spring frost falls near April 5 — 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 Stillwater, OK?
Expect Stillwater's first fall frost near October 30 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Stillwater in?
Stillwater 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 Stillwater?
Stillwater has about 208 frost-free days — a moderate growing season — between the average last spring frost (April 5) and first fall frost (October 30).
When should I plant tomatoes in Stillwater?
For Stillwater, sow tomatoes indoors about February 8–February 22 and move the seedlings out around April 12, after the last spring frost.
Never miss a window in Stillwater
An email when it’s time to start seeds, transplant, and sow — timed to Stillwater’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Guthrie · 41 km
- Edmond · 59 km
- Ponca City · 65 km
- Choctaw · 74 km
- Enid · 78 km
- Midwest City · 80 km
- Del City · 83 km
- Warr Acres · 83 km
Frost dates recorded at STILLWATER 2 W, 2 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 Stillwater, OK — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00053926. Retrieved from https://blissgarden.com/oklahoma/stillwater.