Last frost date in Owasso, OK
In Owasso, the last spring frost comes around March 31 in an average year. Wait until April 15 if you want 90% odds of no more frost. The first fall frost usually arrives about November 4, which leaves 220 frost-free days. An early freeze before October 20 happens one year in ten.
- Safe after (10% risk)
- Apr 15
- Average first frost
- Nov 4
- Frost-free season
- 220 days
- Hard freeze (28°F) ends
- Mar 17
No frost in the next 7 nights
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2254°
- FriOct 2354°
- SatOct 2455°
- SunOct 2555°
- MonOct 2652°
- TueOct 2749°
- WedOct 2852°
Planting calendar for Owasso
Windows count forward or back from the average frost dates above. Click a crop for dates across Oklahoma.
TomatoesApr 7–Apr 21
PumpkinsApr 14–Apr 28
SunflowersMar 31–Apr 21
CucumbersApr 14–Apr 21
CornApr 7–Apr 21
Sweet potatoesApr 21–May 5
WatermelonApr 14–Apr 28
Green beansApr 7–Apr 28
ZucchiniApr 7–Apr 21
OkraApr 21–May 5
PeppersApr 14–Apr 28
BasilApr 7–Apr 21
Butternut squashApr 7–Apr 21
CantaloupeApr 14–Apr 28
EggplantApr 14–Apr 28
PotatoesMar 3–Mar 17
OnionsFeb 17–Mar 10
CarrotsMar 10–Apr 14
LettuceMar 17–Apr 7
BroccoliMar 3–Mar 17
BeetsMar 3–Apr 14
PeasFeb 17–Mar 3
CabbageMar 3–Mar 17
RadishesFeb 24–Apr 7
Brussels sproutsMar 17–Mar 31
SpinachFeb 17–Mar 10
CilantroMar 17–Apr 7
KaleMar 3–Mar 17
Collard greensMar 3–Mar 17
TurnipsMar 3–Mar 17
DillMar 31–Apr 14
CeleryApr 7–Apr 14
CauliflowerMar 17–Mar 31
LeeksMar 17–Mar 31
Swiss chardMar 17–Apr 14
ParsleyMar 17–Apr 7
Tulip bulbsOct 21–Nov 25
GarlicOct 14–Nov 18
Daffodil bulbsOct 7–Nov 18
StrawberriesMar 3–Mar 17
AsparagusMar 3–Mar 17Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Mar 11 | Mar 31 | Apr 15 | Oct 20 | Nov 4 | Nov 19 |
| Hard freeze, 28°F | Feb 28 | Mar 17 | Apr 5 | Oct 31 | Nov 13 | Dec 1 |
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 Tulsa International Airport (USW00013968) sits 6.7 miles from the center of Owasso at 650 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 Owasso, OK?
The average last frost date in Owasso is March 31, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 15.
When is the first frost in Owasso?
The first frost in fall usually comes around November 4. One year in ten it arrives before October 20.
How long is the growing season in Owasso?
About 220 days between the average last and first frost.
When should I plant tomatoes in Owasso?
Plant tomato seedlings outside from April 7 to April 21. Start seeds indoors six to eight weeks earlier.
Nearby in Oklahoma
- TulsaMar 31
- ClaremoreApr 7
- Broken ArrowApr 1
- Sand SpringsMar 30
- JenksMar 30
- BixbyApr 1
- SapulpaMar 30
- BartlesvilleApr 11
- MuskogeeApr 7
- StillwaterApr 5
- Ponca CityApr 10
- ShawneeMar 30