Frost dates · USDA zone 7a
Frost dates for Stillwater, OK
Stillwater, OK sees its last 32 °F night of spring around April 5 and its first of fall around October 30 — a 206-day freeze-free season in a typical year.
Pick a sauce; the Plan Builder runs this station's dates and hands back the calendar, plant count and gear list.
Freeze odds, by date
| Odds | Last spring freeze after | First fall freeze before |
|---|---|---|
| 9 years in 10 | Mar 21 | Nov 15 |
| Median — 1 year in 2 | Apr 5 | Oct 30 |
| 1 year in 10 | Apr 21 | Oct 16 |
The top row is the risky edge: in 9 years of 10 a spring freeze still comes after it, so tender transplants set out then need cover. The bottom row is the cautious date — only 1 year in 10 freezes after it — and the one to plan uncovered tender transplants against. Freeze-free season: 206 days median, at least 184 in 9 years of 10, at least 227 days in 1 year of 10. NOAA ranks season length year by year, so it is not the gap between two rows above. A hard freeze (28 °F) has a median last date of Mar 27 and first of Nov 9.
Stillwater planting calendar, 2027
Every row runs from the median last frost (Apr 5) and median first frost (Oct 30) above, using each cultivar's days to maturity. Same engine as the Plan Builder.
| Crop | Start indoors | Transplant / plant | First harvest | Days |
|---|---|---|---|---|
| Hardneck GarlicSiberian (porcelain hardneck) | — | Oct 15prior fall | Jun 12 | 240 from sow |
| Spanish OnionYellow Sweet Spanish (long-day) | Jan 11 | Mar 8 | Jun 26 | 110 from transplant |
| Mustard greensGarnet Giant (Brassica juncea) | Direct sow | Apr 5 | May 5 | 30 from sow |
| CilantroSlow Bolt (Coriandrum sativum) | Mar 22 | Mar 22 | May 6 | 45 from sow |
| Genovese BasilGenovese | Mar 8 | Apr 19 | Jun 18 | 60 from transplant |
| CayenneLong Slim Cayenne (Capsicum annuum) | Feb 8 | Apr 12 | Jun 26 | 75 from transplant |
| HabaneroOrange Habanero (Capsicum chinense) | Jan 25 | Apr 19 | Jul 23 | 95 from transplant |
| JalapeñoEarly Jalapeño (Capsicum annuum) | Feb 8 | Apr 12 | Jun 26 | 75 from transplant |
| Marconi Red PepperMarconi Red (Capsicum annuum) | Feb 8 | Apr 12 | Jul 1 | 80 from transplant |
| SerranoSerrano Tampiqueño (Capsicum annuum) | Feb 8 | Apr 12 | Jul 1 | 80 from transplant |
| Nantes CarrotScarlet Nantes | Mar 22 | Mar 22 | May 31 | 70 from sow |
| TomatilloToma Verde | Feb 22 | Apr 12 | Jun 21 | 70 from transplant |
| Roma TomatoRoma VF (determinate paste) | Feb 22 | Apr 12 | Jun 26 | 75 from transplant |
| San Marzano TomatoSan Marzano (indeterminate paste) | Feb 22 | Apr 12 | Jul 1 | 80 from transplant |
Tight means first harvest lands within two weeks of the median first fall frost: start that crop indoors on time or cover it in fall.
What sauce can Stillwater grow?
Each sauce, scheduled for a Stillwater container garden: when the first seeds go in and when enough fruit has ripened for one batch.
Stillwater frost questions
When is the last frost in Stillwater, OK?
The median last 32 °F freeze at STILLWATER 2 W, OK is April 5: half of years see a later one. One year in ten, a freeze still comes after April 21; nine years in ten, it comes after March 21. Source: NOAA NCEI 1991–2020 U.S. Climate Normals.
When is the first frost in Stillwater, OK?
The median first 32 °F freeze of fall is October 30. One year in ten it arrives before October 16; nine years in ten, before November 15.
How long is the growing season in Stillwater, OK?
206 days between the last spring and first fall 32 °F freeze in a median year. Nine years in ten the season runs at least 184 days; one year in ten, at least 227 days.
What growing zone is Stillwater, OK?
USDA hardiness zone 7a, per the 2023 USDA Plant Hardiness Zone Map for ZIP 74078. A zone describes the coldest winter night, not when frost ends, so it is the wrong number for a planting calendar — the frost dates on this page are the right one.
When should I plant tomatoes in Stillwater, OK?
Start Roma VF (determinate paste) seeds indoors around Feb 22 and transplant around Apr 12, 1 week after the median last frost. To cut the freeze risk to one year in ten, wait for Apr 21. First ripe fruit lands around Jun 26.
When should I plant peppers in Stillwater, OK?
Sow jalapeño indoors on a heat mat around Feb 8; transplant no earlier than Apr 12, and wait past it until nights hold above 50 °F — that can run weeks later. First green pods around Jun 26.
Nearby in Oklahoma
- Edmondlast frost Apr 10
- Enidlast frost Apr 6
- Midwest Citylast frost Apr 2
- Oklahoma Citylast frost Apr 4
- Moorelast frost Mar 31
- Normanlast frost Mar 31
All Oklahoma frost dates → · How frost-date math drives a sowing calendar →