Frost dates for 74078Stillwater, OK
The average last spring frost in Stillwater is April 5 and the average first fall frost is October 30, giving a typical growing season of about 206 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 5
- Average first fall frost
- Oct 30
- Growing season
- 206 days
Safer after Apr 21 (1-in-10 risk)
Possible by Oct 16 (1-in-10 risk)
First frost typically in 3 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Apr 1 · Apr 17 · May 2 | Oct 6 · Oct 22 · Nov 3 | 185 days | 100% |
| Frost / freeze (32°F) | Mar 21 · Apr 5 · Apr 21 | Oct 16 · Oct 30 · Nov 15 | 206 days | 100% |
| Hard freeze (28°F) | Mar 6 · Mar 27 · Apr 10 | Oct 24 · Nov 9 · Nov 25 | 227 days | 100% |
Planting calendar for Stillwater
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Mar 5 – May 11 |
| Tomatoes | Transplant outdoors | Apr 21 – Jul 10 |
| Peppers | Start seeds indoors | Mar 5 – Apr 5 |
| Peppers | Transplant outdoors | May 5 – Jun 5 |
| Eggplant | Start seeds indoors | Mar 22 – Apr 20 |
| Eggplant | Transplant outdoors | May 5 – Jun 5 |
| Cucumbers | Sow outdoors | May 5 – Jul 20 |
| Summer squash | Sow outdoors | Apr 21 – Jun 5 |
| Winter squash & pumpkins | Sow outdoors | May 5 – Jun 5 |
| Snap beans | Sow outdoors | Apr 21 – Aug 12 |
| Sweet corn | Sow outdoors | Apr 21 – Jul 10 |
| Watermelon & cantaloupe | Sow outdoors | May 5 – Jun 5 |
| Okra | Sow outdoors | Apr 28 – May 21 |
| Peas | Sow outdoors (spring) | Mar 5 – Apr 20 |
| Potatoes | Plant outdoors (spring) | Mar 5 – May 5 |
| Onions | Start seeds indoors (spring) | Jan 22 – Feb 18 |
| Onions | Transplant outdoors (spring) | Mar 22 – Apr 20 |
| Broccoli | Start seeds indoors (spring) | Feb 15 – Mar 21 |
| Broccoli | Transplant outdoors (spring) | Mar 22 – Apr 20 |
| Broccoli | Start seeds indoors (fall) | Jun 30 – Jul 10 |
| Broccoli | Transplant outdoors (fall) | Jul 30 – Aug 10 |
| Cabbage | Start seeds indoors (spring) | Feb 5 – Mar 5 |
| Cabbage | Transplant outdoors (spring) | Mar 5 – Apr 5 |
| Cabbage | Start seeds indoors (fall) | Jun 20 – Jul 20 |
| Cabbage | Transplant outdoors (fall) | Jul 20 – Aug 20 |
| Leaf lettuce | Sow outdoors (spring) | Mar 5 – May 21 |
| Leaf lettuce | Sow outdoors (fall) | Jul 20 – Sep 5 |
| Spinach | Sow outdoors (spring) | Feb 26 – Apr 11 |
| Spinach | Sow outdoors (fall) | Aug 6 – Sep 10 |
| Radishes | Sow outdoors (spring) | Mar 5 – Apr 25 |
| Radishes | Sow outdoors (fall) | Jul 20 – Sep 20 |
| Kale | Sow outdoors (spring) | Mar 22 – Apr 11 |
| Kale | Sow outdoors (fall) | Jul 13 – Aug 20 |
| Carrots | Sow outdoors (spring) | Apr 5 – May 21 |
| Carrots | Sow outdoors (fall) | Jun 20 – Aug 5 |
| Garlic | Plant outdoors (fall) | Oct 20 – Nov 20 |
Where these dates come from
ZIP code 74078 is matched to the NOAA station Stillwater 2 W, OK, 2 km away, at 890 ft elevation (22 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Stillwater 2 W, OK (used) | 890 ft | Apr 5 | Oct 30 |
| Stillwater Mesonet, OK | 892 ft | Apr 6 | Oct 31 |
| Stillwater 2 W, OK | 895 ft | Apr 8 | Oct 27 |
| Stillwater 5 Wnw, OK | 888 ft | Apr 12 | Oct 27 |
Frost dates near Stillwater
- Stillwater, OK 74077 · last Apr 5, first Oct 30
- Perkins, OK 74059 · last Apr 8, first Oct 27
- Glencoe, OK 74032 · last Apr 3, first Oct 31
- Morrison, OK 73061 · last Apr 3, first Oct 31
- Ripley, OK 74062 · last Apr 1, first Nov 5
- Langston, OK 73050 · last Apr 3, first Nov 1
- Perry, OK 73077 · last Apr 4, first Nov 1
- Tryon, OK 74875 · last Apr 7, first Oct 30
Frequently asked questions
- When is the last frost in Stillwater, OK?
- For ZIP code 74078, the average last spring frost (32°F) is April 5, based on NOAA 1991-2020 climate normals for the Stillwater 2 W, OK weather station. There is a 1-in-10 chance of a frost after April 21.
- When is the first frost in Stillwater, OK?
- The average first fall frost (32°F) is October 30. There is a 1-in-10 chance of frost by October 16, so tender plants are at risk from that point on.
- How long is the growing season in 74078?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 206 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.