Stillwater, OK planting zone & frost dates
Stillwater is in USDA hardiness zone 7a. The last spring frost usually comes around April 5 and the first fall frost around October 30, for a growing season of about 206 days.
Planting calendar for Stillwater
Dates are counted from the average last spring frost (April 5) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.
| Crop | When |
|---|---|
| Tomatoes | Start seeds indoors: Feb 8 – Feb 22 Transplant outdoors: Apr 12 – Apr 19 |
| Peppers | Start seeds indoors: Jan 25 – Feb 8 Transplant outdoors: Apr 19 – Apr 26 |
| Eggplant | Start seeds indoors: Jan 25 – Feb 8 Transplant outdoors: Apr 19 – Apr 26 |
| Broccoli | Start seeds indoors: Jan 25 – Feb 8 Transplant outdoors: Mar 8 – Mar 22 |
| Cabbage | Start seeds indoors: Jan 25 – Feb 8 Transplant outdoors: Mar 8 – Mar 22 |
| Onions (sets) | Plant outdoors: Mar 8 – Mar 22 |
| Peas | Sow outdoors: Feb 22 – Mar 8 |
| Spinach | Sow outdoors: Feb 22 – Mar 8 |
| Lettuce | Sow outdoors: Mar 8 – Mar 22 |
| Carrots | Sow outdoors: Mar 8 – Mar 22 |
| Potatoes | Plant outdoors: Mar 8 – Mar 22 |
| Beans | Sow outdoors: Apr 12 – Apr 19 |
| Sweet corn | Sow outdoors: Apr 12 – Apr 19 |
| Cucumbers | Sow outdoors: Apr 12 – Apr 19 |
| Squash & zucchini | Sow outdoors: Apr 12 – Apr 19 |
| Basil | Start seeds indoors: Feb 22 – Mar 8 Transplant outdoors: Apr 12 – Apr 19 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 4 (8 weeks before the average first fall frost on Oct 30).
Useful for zone 7a gardens
- Seed starting kit with dome — to start seeds indoors before the last frost
- LED grow light for seedlings — stops leggy seedlings
- Frost cloth / plant covers — for late spring and early fall frosts
- Soil thermometer — warm-season crops need soil above 60°F
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Mar 21 | Apr 5 | Apr 21 |
| First 32°F frost in fall is before | Nov 15 | Oct 30 | Oct 16 |
How to read it: in spring there is a 10% chance of a frost after April 21, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 16. A hard freeze (28°F) usually ends around March 27.
Hardiness zone by ZIP code in Stillwater
- 74074 zone 7a
- 74075 zone 7a
- 74076 zone 7a
- 74077 zone 7a
- 74078 zone 7a
Nearby cities
- Guthrie zone 7b, last frost Apr 3
- Ponca City zone 7a, last frost Apr 10
- Edmond zone 7b, last frost Apr 2
- Choctaw zone 7b, last frost Apr 2
- Midwest City zone 7b, last frost Apr 2
- Del City zone 7b, last frost Apr 2
- Oklahoma City zone 7b, last frost Apr 4
- Shawnee zone 7b, last frost Mar 30
Questions
What growing zone is Stillwater, OK?
Stillwater is in USDA Plant Hardiness Zone 7a (average extreme winter low 0°F to 5°F), according to the USDA 2023 map.
When is the last frost in Stillwater?
The average last spring frost (32°F) in Stillwater is April 5. There is still a 10% chance of frost until April 21.
When can I plant tomatoes in Stillwater?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Apr 12 – Apr 19. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Stillwater 2 W, OK (USW00053926), 3.0 km (1.9 mi) from the city center, elevation 271 m, based on 19 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.