Last frost date in Stillwater, OK
Expect the last frost in Stillwater around April 5. Frost after April 21 happens in only one year out of ten. The first fall frost usually arrives about October 30, which leaves 206 frost-free days. An early freeze before October 16 happens one year in ten.
- Safe after (10% risk)
- Apr 21
- Average first frost
- Oct 30
- Frost-free season
- 206 days
- Hard freeze (28°F) ends
- Mar 27
No frost in the next 7 nights
National Weather Service forecast, updated Oct 22, 12:24 UTC
- ThuOct 2254°
- FriOct 2355°
- SatOct 2455°
- SunOct 2554°
- MonOct 2651°
- TueOct 2748°
- WedOct 2851°
Planting calendar for Stillwater
Windows count forward or back from the average frost dates above. Click a crop for dates across Oklahoma.
TomatoesApr 12–Apr 26
PumpkinsApr 19–May 3
SunflowersApr 5–Apr 26
CucumbersApr 19–Apr 26
CornApr 12–Apr 26
Sweet potatoesApr 26–May 10
WatermelonApr 19–May 3
Green beansApr 12–May 3
ZucchiniApr 12–Apr 26
OkraApr 26–May 10
PeppersApr 19–May 3
BasilApr 12–Apr 26
Butternut squashApr 12–Apr 26
CantaloupeApr 19–May 3
EggplantApr 19–May 3
PotatoesMar 8–Mar 22
OnionsFeb 22–Mar 15
CarrotsMar 15–Apr 19
LettuceMar 22–Apr 12
BroccoliMar 8–Mar 22
BeetsMar 8–Apr 19
PeasFeb 22–Mar 8
CabbageMar 8–Mar 22
RadishesMar 1–Apr 12
Brussels sproutsMar 22–Apr 5
SpinachFeb 22–Mar 15
CilantroMar 22–Apr 12
KaleMar 8–Mar 22
Collard greensMar 8–Mar 22
TurnipsMar 8–Mar 22
DillApr 5–Apr 19
CeleryApr 12–Apr 19
CauliflowerMar 22–Apr 5
LeeksMar 22–Apr 5
Swiss chardMar 22–Apr 19
ParsleyMar 22–Apr 12
Tulip bulbsOct 16–Nov 20
GarlicOct 9–Nov 13
Daffodil bulbsOct 2–Nov 13
StrawberriesMar 8–Mar 22
AsparagusMar 8–Mar 22Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Mar 21 | Apr 5 | Apr 21 | Oct 16 | Oct 30 | Nov 15 |
| Hard freeze, 28°F | Mar 6 | Mar 27 | Apr 10 | Oct 24 | Nov 9 | Nov 25 |
Read the spring 10% column as the date after which only one year in ten still gets frost. That is the safer date for tomatoes, peppers and basil.
Where these numbers come from
NOAA station Stillwater 2 W (USW00053926) sits 1.3 miles from the center of Stillwater at 890 feet. Its averages cover 1991 to 2020. Low spots, valleys and open fields can keep getting frost a week or two after the station stops; city centers and lakeshores usually get less of it.
Questions
When is the last frost in Stillwater, OK?
The average last frost date in Stillwater is April 5, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 21.
When is the first frost in Stillwater?
The first frost in fall usually comes around October 30. One year in ten it arrives before October 16.
How long is the growing season in Stillwater?
About 206 days between the average last and first frost.
When should I plant tomatoes in Stillwater?
Plant tomato seedlings outside from April 12 to April 26. Start seeds indoors six to eight weeks earlier.
Nearby in Oklahoma
- EdmondApr 10
- Ponca CityApr 10
- EnidApr 6
- Midwest CityApr 2
- Del CityApr 2
- Oklahoma CityApr 4
- Sand SpringsMar 30
- ShawneeMar 30
- BethanyApr 2
- SapulpaMar 30
- YukonApr 2
- MooreMar 31