Frost dates for 74447Okmulgee, OK
The average last spring frost in Okmulgee is April 8 and the average first fall frost is October 28, giving a typical growing season of about 203 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 8
- Average first fall frost
- Oct 28
- Growing season
- 203 days
Safer after Apr 25 (1-in-10 risk)
Possible by Oct 12 (1-in-10 risk)
First frost typically in 2 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 19 · May 3 | Oct 5 · Oct 20 · Nov 2 | 184 days | 100% |
| Frost / freeze (32°F) | Mar 23 · Apr 8 · Apr 25 | Oct 12 · Oct 28 · Nov 11 | 203 days | 100% |
| Hard freeze (28°F) | Mar 11 · Mar 29 · Apr 15 | Oct 22 · Nov 6 · Nov 23 | 224 days | 100% |
Planting calendar for Okmulgee
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 8 – May 14 |
| Tomatoes | Transplant outdoors | Apr 24 – Jul 8 |
| Peppers | Start seeds indoors | Mar 8 – Apr 8 |
| Peppers | Transplant outdoors | May 8 – Jun 8 |
| Eggplant | Start seeds indoors | Mar 25 – Apr 23 |
| Eggplant | Transplant outdoors | May 8 – Jun 8 |
| Cucumbers | Sow outdoors | May 8 – Jul 18 |
| Summer squash | Sow outdoors | Apr 24 – Jun 8 |
| Winter squash & pumpkins | Sow outdoors | May 8 – Jun 8 |
| Snap beans | Sow outdoors | Apr 24 – Aug 10 |
| Sweet corn | Sow outdoors | Apr 24 – Jul 8 |
| Watermelon & cantaloupe | Sow outdoors | May 8 – Jun 8 |
| Okra | Sow outdoors | May 1 – May 24 |
| Peas | Sow outdoors (spring) | Mar 8 – Apr 23 |
| Potatoes | Plant outdoors (spring) | Mar 8 – May 8 |
| Onions | Start seeds indoors (spring) | Jan 25 – Feb 21 |
| Onions | Transplant outdoors (spring) | Mar 25 – Apr 23 |
| Broccoli | Start seeds indoors (spring) | Feb 18 – Mar 24 |
| Broccoli | Transplant outdoors (spring) | Mar 25 – Apr 23 |
| Broccoli | Start seeds indoors (fall) | Jun 28 – Jul 8 |
| Broccoli | Transplant outdoors (fall) | Jul 28 – Aug 8 |
| Cabbage | Start seeds indoors (spring) | Feb 8 – Mar 8 |
| Cabbage | Transplant outdoors (spring) | Mar 8 – Apr 8 |
| Cabbage | Start seeds indoors (fall) | Jun 18 – Jul 18 |
| Cabbage | Transplant outdoors (fall) | Jul 18 – Aug 18 |
| Leaf lettuce | Sow outdoors (spring) | Mar 8 – May 24 |
| Leaf lettuce | Sow outdoors (fall) | Jul 18 – Sep 3 |
| Spinach | Sow outdoors (spring) | Mar 1 – Apr 14 |
| Spinach | Sow outdoors (fall) | Aug 4 – Sep 8 |
| Radishes | Sow outdoors (spring) | Mar 8 – Apr 28 |
| Radishes | Sow outdoors (fall) | Jul 18 – Sep 18 |
| Kale | Sow outdoors (spring) | Mar 25 – Apr 14 |
| Kale | Sow outdoors (fall) | Jul 11 – Aug 18 |
| Carrots | Sow outdoors (spring) | Apr 8 – May 24 |
| Carrots | Sow outdoors (fall) | Jun 18 – Aug 3 |
| Garlic | Plant outdoors (fall) | Oct 18 – Nov 18 |
Where these dates come from
ZIP code 74447 is matched to the NOAA station Okmulgee Wtr Wks, OK, 5 km away, at 647 ft elevation (6 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Okmulgee Wtr Wks, OK (used) | 647 ft | Apr 8 | Oct 28 |
| Okemah, OK | 935 ft | Mar 24 | Nov 9 |
| Bixby, OK | 605 ft | Apr 1 | Nov 1 |
| Bristow, OK | 830 ft | Apr 9 | Oct 25 |
Frost dates near Okmulgee
- Preston, OK 74456 · last Apr 8, first Oct 28
- Schulter, OK 74460 · last Apr 8, first Oct 28
- Morris, OK 74445 · last Apr 8, first Oct 28
- Beggs, OK 74421 · last Apr 1, first Nov 1
- Henryetta, OK 74437 · last Mar 24, first Nov 9
- Dewar, OK 74431 · last Apr 8, first Oct 28
- Hitchita, OK 74438 · last Apr 2, first Nov 2
- Boynton, OK 74422 · last Apr 2, first Nov 2
Frequently asked questions
- When is the last frost in Okmulgee, OK?
- For ZIP code 74447, the average last spring frost (32°F) is April 8, based on NOAA 1991-2020 climate normals for the Okmulgee Wtr Wks, OK weather station. There is a 1-in-10 chance of a frost after April 25.
- When is the first frost in Okmulgee, OK?
- The average first fall frost (32°F) is October 28. There is a 1-in-10 chance of frost by October 12, so tender plants are at risk from that point on.
- How long is the growing season in 74447?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 203 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.