Frost dates for 74727Boswell, OK
The average last spring frost in Boswell is April 3 and the average first fall frost is November 1, giving a typical growing season of about 213 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 3
- Average first fall frost
- Nov 1
- Growing season
- 213 days
Safer after Apr 20 (1-in-10 risk)
Possible by Oct 18 (1-in-10 risk)
First frost typically in 6 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 30 · Apr 14 · Apr 29 | Oct 10 · Oct 23 · Nov 5 | 192 days | 100% |
| Frost / freeze (32°F) | Mar 15 · Apr 3 · Apr 20 | Oct 18 · Nov 1 · Nov 17 | 213 days | 100% |
| Hard freeze (28°F) | Feb 28 · Mar 20 · Apr 6 | Oct 27 · Nov 11 · Dec 1 | 236 days | 100% |
Planting calendar for Boswell
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 3 – May 9 |
| Tomatoes | Transplant outdoors | Apr 19 – Jul 12 |
| Peppers | Start seeds indoors | Mar 3 – Apr 3 |
| Peppers | Transplant outdoors | May 3 – Jun 3 |
| Eggplant | Start seeds indoors | Mar 20 – Apr 18 |
| Eggplant | Transplant outdoors | May 3 – Jun 3 |
| Cucumbers | Sow outdoors | May 3 – Jul 22 |
| Summer squash | Sow outdoors | Apr 19 – Jun 3 |
| Winter squash & pumpkins | Sow outdoors | May 3 – Jun 3 |
| Snap beans | Sow outdoors | Apr 19 – Aug 14 |
| Sweet corn | Sow outdoors | Apr 19 – Jul 12 |
| Watermelon & cantaloupe | Sow outdoors | May 3 – Jun 3 |
| Okra | Sow outdoors | Apr 26 – May 19 |
| Peas | Sow outdoors (spring) | Mar 3 – Apr 18 |
| Potatoes | Plant outdoors (spring) | Mar 3 – May 3 |
| Onions | Start seeds indoors (spring) | Jan 20 – Feb 16 |
| Onions | Transplant outdoors (spring) | Mar 20 – Apr 18 |
| Broccoli | Start seeds indoors (spring) | Feb 13 – Mar 19 |
| Broccoli | Transplant outdoors (spring) | Mar 20 – Apr 18 |
| Broccoli | Start seeds indoors (fall) | Jul 2 – Jul 12 |
| Broccoli | Transplant outdoors (fall) | Aug 1 – Aug 12 |
| Cabbage | Start seeds indoors (spring) | Feb 3 – Mar 3 |
| Cabbage | Transplant outdoors (spring) | Mar 3 – Apr 3 |
| Cabbage | Start seeds indoors (fall) | Jun 22 – Jul 22 |
| Cabbage | Transplant outdoors (fall) | Jul 22 – Aug 22 |
| Leaf lettuce | Sow outdoors (spring) | Mar 3 – May 19 |
| Leaf lettuce | Sow outdoors (fall) | Jul 22 – Sep 7 |
| Spinach | Sow outdoors (spring) | Feb 24 – Apr 9 |
| Spinach | Sow outdoors (fall) | Aug 8 – Sep 12 |
| Radishes | Sow outdoors (spring) | Mar 3 – Apr 23 |
| Radishes | Sow outdoors (fall) | Jul 22 – Sep 22 |
| Kale | Sow outdoors (spring) | Mar 20 – Apr 9 |
| Kale | Sow outdoors (fall) | Jul 15 – Aug 22 |
| Carrots | Sow outdoors (spring) | Apr 3 – May 19 |
| Carrots | Sow outdoors (fall) | Jun 22 – Aug 7 |
| Garlic | Plant outdoors (fall) | Oct 22 – Nov 22 |
Where these dates come from
ZIP code 74727 is matched to the NOAA station Antlers, OK, 30.1 km away, at 470 ft elevation (65 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Antlers, OK (used) | 470 ft | Apr 3 | Nov 1 |
| Antlers 5Nw, OK | 578 ft | Apr 2 | Nov 1 |
| Hugo, OK | 520 ft | Mar 15 | Nov 15 |
| Mcgee Creek Dam, OK | 672 ft | Mar 27 | Nov 9 |
Frost dates near Boswell
- Soper, OK 74759 · last Apr 3, first Nov 1
- Bennington, OK 74723 · last Mar 31, first Nov 5
- Arthur City, TX 75411 · last Mar 14, first Nov 16
- Lane, OK 74555 · last Mar 27, first Nov 9
- Bokchito, OK 74726 · last Mar 31, first Nov 5
- Hugo, OK 74743 · last Mar 15, first Nov 15
- Chicota, TX 75425 · last Mar 14, first Nov 16
- Antlers, OK 74523 · last Apr 3, first Nov 1
Frequently asked questions
- When is the last frost in Boswell, OK?
- For ZIP code 74727, the average last spring frost (32°F) is April 3, based on NOAA 1991-2020 climate normals for the Antlers, OK weather station. There is a 1-in-10 chance of a frost after April 20.
- When is the first frost in Boswell, 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 74727?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 213 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.