Frost dates for 74937Heavener, OK
The average last spring frost in Heavener is April 6 and the average first fall frost is November 2, giving a typical growing season of about 210 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 6
- Average first fall frost
- Nov 2
- Growing season
- 210 days
Safer after Apr 24 (1-in-10 risk)
Possible by Oct 18 (1-in-10 risk)
Last frost typically in 154 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 28 · Apr 15 · Apr 30 | Oct 9 · Oct 24 · Nov 6 | 190 days | 100% |
| Frost / freeze (32°F) | Mar 18 · Apr 6 · Apr 24 | Oct 18 · Nov 2 · Nov 17 | 210 days | 100% |
| Hard freeze (28°F) | Mar 4 · Mar 25 · Apr 15 | Oct 30 · Nov 12 · Nov 30 | 231 days | 100% |
Planting calendar for Heavener
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 6 – May 12 |
| Tomatoes | Transplant outdoors | Apr 22 – Jul 13 |
| Peppers | Start seeds indoors | Mar 6 – Apr 6 |
| Peppers | Transplant outdoors | May 6 – Jun 6 |
| Eggplant | Start seeds indoors | Mar 23 – Apr 21 |
| Eggplant | Transplant outdoors | May 6 – Jun 6 |
| Cucumbers | Sow outdoors | May 6 – Jul 23 |
| Summer squash | Sow outdoors | Apr 22 – Jun 6 |
| Winter squash & pumpkins | Sow outdoors | May 6 – Jun 6 |
| Snap beans | Sow outdoors | Apr 22 – Aug 15 |
| Sweet corn | Sow outdoors | Apr 22 – Jul 13 |
| Watermelon & cantaloupe | Sow outdoors | May 6 – Jun 6 |
| Okra | Sow outdoors | Apr 29 – May 22 |
| Peas | Sow outdoors (spring) | Mar 6 – Apr 21 |
| Potatoes | Plant outdoors (spring) | Mar 6 – May 6 |
| Onions | Start seeds indoors (spring) | Jan 23 – Feb 19 |
| Onions | Transplant outdoors (spring) | Mar 23 – Apr 21 |
| Broccoli | Start seeds indoors (spring) | Feb 16 – Mar 22 |
| Broccoli | Transplant outdoors (spring) | Mar 23 – Apr 21 |
| Broccoli | Start seeds indoors (fall) | Jul 3 – Jul 13 |
| Broccoli | Transplant outdoors (fall) | Aug 2 – Aug 13 |
| Cabbage | Start seeds indoors (spring) | Feb 6 – Mar 6 |
| Cabbage | Transplant outdoors (spring) | Mar 6 – Apr 6 |
| Cabbage | Start seeds indoors (fall) | Jun 23 – Jul 23 |
| Cabbage | Transplant outdoors (fall) | Jul 23 – Aug 23 |
| Leaf lettuce | Sow outdoors (spring) | Mar 6 – May 22 |
| Leaf lettuce | Sow outdoors (fall) | Jul 23 – Sep 8 |
| Spinach | Sow outdoors (spring) | Feb 27 – Apr 12 |
| Spinach | Sow outdoors (fall) | Aug 9 – Sep 13 |
| Radishes | Sow outdoors (spring) | Mar 6 – Apr 26 |
| Radishes | Sow outdoors (fall) | Jul 23 – Sep 23 |
| Kale | Sow outdoors (spring) | Mar 23 – Apr 12 |
| Kale | Sow outdoors (fall) | Jul 16 – Aug 23 |
| Carrots | Sow outdoors (spring) | Apr 6 – May 22 |
| Carrots | Sow outdoors (fall) | Jun 23 – Aug 8 |
| Garlic | Plant outdoors (fall) | Oct 23 – Nov 23 |
Where these dates come from
ZIP code 74937 is matched to the NOAA station Wister 3S, OK, 14.2 km away, at 525 ft elevation (13 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Wister 3S, OK (used) | 525 ft | Apr 6 | Nov 2 |
| Mena, AR | 1,152 ft | Apr 5 | Nov 1 |
| Smithville, OK | 822 ft | Apr 9 | Oct 29 |
| Mc Curtain 1 Se, OK | 655 ft | Mar 23 | Nov 5 |
Frost dates near Heavener
- Hodgen, OK 74939 · last Apr 9, first Oct 29
- Howe, OK 74940 · last Apr 6, first Nov 2
- Monroe, OK 74947 · last Apr 6, first Nov 2
- Wister, OK 74966 · last Apr 6, first Nov 2
- Muse, OK 74949 · last Apr 13, first Oct 27
- Poteau, OK 74953 · last Apr 6, first Nov 2
- Fanshawe, OK 74935 · last Mar 23, first Nov 5
- Whitesboro, OK 74577 · last Apr 13, first Oct 27
Frequently asked questions
- When is the last frost in Heavener, OK?
- For ZIP code 74937, the average last spring frost (32°F) is April 6, based on NOAA 1991-2020 climate normals for the Wister 3S, OK weather station. There is a 1-in-10 chance of a frost after April 24.
- When is the first frost in Heavener, OK?
- The average first fall frost (32°F) is November 2. 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 74937?
- 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.