Frost dates for 73669Thomas, OK
The average last spring frost in Thomas is April 3 and the average first fall frost is November 3, giving a typical growing season of about 214 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 3
- Average first fall frost
- Nov 3
- Growing season
- 214 days
Safer after Apr 21 (1-in-10 risk)
Possible by Oct 20 (1-in-10 risk)
First frost typically in 7 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 15 · May 1 | Oct 13 · Oct 24 · Nov 6 | 193 days | 100% |
| Frost / freeze (32°F) | Mar 16 · Apr 3 · Apr 21 | Oct 20 · Nov 3 · Nov 18 | 214 days | 100% |
| Hard freeze (28°F) | Mar 2 · Mar 21 · Apr 7 | Oct 26 · Nov 11 · Nov 28 | 235 days | 100% |
Planting calendar for Thomas
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 14 |
| 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 24 |
| Summer squash | Sow outdoors | Apr 19 – Jun 3 |
| Winter squash & pumpkins | Sow outdoors | May 3 – Jun 3 |
| Snap beans | Sow outdoors | Apr 19 – Aug 16 |
| Sweet corn | Sow outdoors | Apr 19 – Jul 14 |
| 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 4 – Jul 14 |
| Broccoli | Transplant outdoors (fall) | Aug 3 – Aug 14 |
| Cabbage | Start seeds indoors (spring) | Feb 3 – Mar 3 |
| Cabbage | Transplant outdoors (spring) | Mar 3 – Apr 3 |
| Cabbage | Start seeds indoors (fall) | Jun 24 – Jul 24 |
| Cabbage | Transplant outdoors (fall) | Jul 24 – Aug 24 |
| Leaf lettuce | Sow outdoors (spring) | Mar 3 – May 19 |
| Leaf lettuce | Sow outdoors (fall) | Jul 24 – Sep 9 |
| Spinach | Sow outdoors (spring) | Feb 24 – Apr 9 |
| Spinach | Sow outdoors (fall) | Aug 10 – Sep 14 |
| Radishes | Sow outdoors (spring) | Mar 3 – Apr 23 |
| Radishes | Sow outdoors (fall) | Jul 24 – Sep 24 |
| Kale | Sow outdoors (spring) | Mar 20 – Apr 9 |
| Kale | Sow outdoors (fall) | Jul 17 – Aug 24 |
| Carrots | Sow outdoors (spring) | Apr 3 – May 19 |
| Carrots | Sow outdoors (fall) | Jun 24 – Aug 9 |
| Garlic | Plant outdoors (fall) | Oct 24 – Nov 24 |
Where these dates come from
ZIP code 73669 is matched to the NOAA station Weatherford, OK, 24.5 km away, at 1,618 ft elevation (111 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Weatherford, OK (used) | 1,618 ft | Apr 3 | Nov 3 |
| Watonga 7W Mesonet, OK | 1,696 ft | Apr 6 | Nov 3 |
| Weatherford 4Wsw Mesnt, OK | 1,765 ft | Apr 6 | Nov 3 |
| Putnam 3N Mesonet, OK | 1,932 ft | Apr 8 | Nov 1 |
Frost dates near Thomas
- Fay, OK 73646 · last Apr 6, first Nov 3
- Custer City, OK 73639 · last Apr 13, first Oct 28
- Oakwood, OK 73658 · last Apr 18, first Oct 21
- Weatherford, OK 73096 · last Apr 3, first Nov 3
- Putnam, OK 73659 · last Apr 8, first Nov 1
- Arapaho, OK 73620 · last Apr 13, first Oct 28
- Watonga, OK 73772 · last Apr 14, first Oct 27
- Greenfield, OK 73043 · last Apr 14, first Oct 27
Frequently asked questions
- When is the last frost in Thomas, OK?
- For ZIP code 73669, the average last spring frost (32°F) is April 3, based on NOAA 1991-2020 climate normals for the Weatherford, OK weather station. There is a 1-in-10 chance of a frost after April 21.
- When is the first frost in Thomas, OK?
- The average first fall frost (32°F) is November 3. There is a 1-in-10 chance of frost by October 20, so tender plants are at risk from that point on.
- How long is the growing season in 73669?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 214 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.