Frost dates for 74818Seminole, OK
The average last spring frost in Seminole is April 5 and the average first fall frost is November 1, giving a typical growing season of about 210 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 5
- Average first fall frost
- Nov 1
- Growing season
- 210 days
Safer after Apr 22 (1-in-10 risk)
Possible by Oct 18 (1-in-10 risk)
Last frost typically in 153 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) | Mar 31 · Apr 16 · Apr 30 | Oct 9 · Oct 24 · Nov 7 | 191 days | 100% |
| Frost / freeze (32°F) | Mar 18 · Apr 5 · Apr 22 | Oct 18 · Nov 1 · Nov 15 | 210 days | 100% |
| Hard freeze (28°F) | Mar 4 · Mar 24 · Apr 10 | Oct 25 · Nov 9 · Nov 27 | 232 days | 100% |
Planting calendar for Seminole
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 12 |
| 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 22 |
| Summer squash | Sow outdoors | Apr 21 – Jun 5 |
| Winter squash & pumpkins | Sow outdoors | May 5 – Jun 5 |
| Snap beans | Sow outdoors | Apr 21 – Aug 14 |
| Sweet corn | Sow outdoors | Apr 21 – Jul 12 |
| 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) | Jul 2 – Jul 12 |
| Broccoli | Transplant outdoors (fall) | Aug 1 – Aug 12 |
| Cabbage | Start seeds indoors (spring) | Feb 5 – Mar 5 |
| Cabbage | Transplant outdoors (spring) | Mar 5 – Apr 5 |
| Cabbage | Start seeds indoors (fall) | Jun 22 – Jul 22 |
| Cabbage | Transplant outdoors (fall) | Jul 22 – Aug 22 |
| Leaf lettuce | Sow outdoors (spring) | Mar 5 – May 21 |
| Leaf lettuce | Sow outdoors (fall) | Jul 22 – Sep 7 |
| Spinach | Sow outdoors (spring) | Feb 26 – Apr 11 |
| Spinach | Sow outdoors (fall) | Aug 8 – Sep 12 |
| Radishes | Sow outdoors (spring) | Mar 5 – Apr 25 |
| Radishes | Sow outdoors (fall) | Jul 22 – Sep 22 |
| Kale | Sow outdoors (spring) | Mar 22 – Apr 11 |
| Kale | Sow outdoors (fall) | Jul 15 – Aug 22 |
| Carrots | Sow outdoors (spring) | Apr 5 – May 21 |
| Carrots | Sow outdoors (fall) | Jun 22 – Aug 7 |
| Garlic | Plant outdoors (fall) | Oct 22 – Nov 22 |
Where these dates come from
ZIP code 74818 is matched to the NOAA station Seminole, OK, 1.8 km away, at 924 ft elevation (31 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Seminole, OK (used) | 924 ft | Apr 5 | Nov 1 |
| Seminole 4Ssw Mesonet, OK | 958 ft | Apr 1 | Nov 1 |
| Shawnee 3Nnw Mesonet, OK | 1,076 ft | Mar 30 | Nov 5 |
| Holdenville 2Sse, OK | 855 ft | Apr 6 | Oct 31 |
Frost dates near Seminole
- Seminole, OK 74868 · last Apr 5, first Nov 1
- Bowlegs, OK 74830 · last Apr 5, first Nov 1
- Wewoka, OK 74884 · last Apr 5, first Nov 1
- Earlsboro, OK 74840 · last Apr 5, first Nov 1
- Maud, OK 74854 · last Apr 5, first Nov 1
- Cromwell, OK 74837 · last Mar 24, first Nov 9
- Saint Louis, OK 74866 · last Apr 5, first Nov 1
- Shawnee, OK 74802 · last Mar 30, first Nov 5
Frequently asked questions
- When is the last frost in Seminole, OK?
- For ZIP code 74818, the average last spring frost (32°F) is April 5, based on NOAA 1991-2020 climate normals for the Seminole, OK weather station. There is a 1-in-10 chance of a frost after April 22.
- When is the first frost in Seminole, OK?
- The average first fall frost (32°F) is November 1. There is a 1-in-10 chance of frost by October 18, so tender plants are at risk from that point on.
- How long is the growing season in 74818?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 210 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.