Frost dates for 79529Knox City, TX
The average last spring frost in Knox City is March 28 and the average first fall frost is November 7, giving a typical growing season of about 225 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 28
- Average first fall frost
- Nov 7
- Growing season
- 225 days
Safer after Apr 14 (1-in-10 risk)
Possible by Oct 25 (1-in-10 risk)
First frost typically in 11 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 23 · Apr 8 · Apr 25 | Oct 17 · Oct 31 · Nov 13 | 203 days | 100% |
| Frost / freeze (32°F) | Mar 9 · Mar 28 · Apr 14 | Oct 25 · Nov 7 · Nov 24 | 225 days | 100% |
| Hard freeze (28°F) | Feb 24 · Mar 15 · Apr 3 | Nov 2 · Nov 17 · Dec 4 | 248 days | 100% |
Planting calendar for Knox City
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 | Feb 25 – May 3 |
| Tomatoes | Transplant outdoors | Apr 13 – Jul 18 |
| Peppers | Start seeds indoors | Feb 25 – Mar 28 |
| Peppers | Transplant outdoors | Apr 27 – May 28 |
| Eggplant | Start seeds indoors | Mar 14 – Apr 12 |
| Eggplant | Transplant outdoors | Apr 27 – May 28 |
| Cucumbers | Sow outdoors | Apr 27 – Jul 28 |
| Summer squash | Sow outdoors | Apr 13 – May 28 |
| Winter squash & pumpkins | Sow outdoors | Apr 27 – May 28 |
| Snap beans | Sow outdoors | Apr 13 – Aug 20 |
| Sweet corn | Sow outdoors | Apr 13 – Jul 18 |
| Watermelon & cantaloupe | Sow outdoors | Apr 27 – May 28 |
| Okra | Sow outdoors | Apr 20 – May 13 |
| Peas | Sow outdoors (spring) | Feb 25 – Apr 12 |
| Potatoes | Plant outdoors (spring) | Feb 25 – Apr 27 |
| Onions | Start seeds indoors (spring) | Jan 14 – Feb 10 |
| Onions | Transplant outdoors (spring) | Mar 14 – Apr 12 |
| Broccoli | Start seeds indoors (spring) | Feb 7 – Mar 13 |
| Broccoli | Transplant outdoors (spring) | Mar 14 – Apr 12 |
| Broccoli | Start seeds indoors (fall) | Jul 8 – Jul 18 |
| Broccoli | Transplant outdoors (fall) | Aug 7 – Aug 18 |
| Cabbage | Start seeds indoors (spring) | Jan 28 – Feb 25 |
| Cabbage | Transplant outdoors (spring) | Feb 25 – Mar 28 |
| Cabbage | Start seeds indoors (fall) | Jun 28 – Jul 28 |
| Cabbage | Transplant outdoors (fall) | Jul 28 – Aug 28 |
| Leaf lettuce | Sow outdoors (spring) | Feb 25 – May 13 |
| Leaf lettuce | Sow outdoors (fall) | Jul 28 – Sep 13 |
| Spinach | Sow outdoors (spring) | Feb 18 – Apr 3 |
| Spinach | Sow outdoors (fall) | Aug 14 – Sep 18 |
| Radishes | Sow outdoors (spring) | Feb 25 – Apr 17 |
| Radishes | Sow outdoors (fall) | Jul 28 – Sep 28 |
| Kale | Sow outdoors (spring) | Mar 14 – Apr 3 |
| Kale | Sow outdoors (fall) | Jul 21 – Aug 28 |
| Carrots | Sow outdoors (spring) | Mar 28 – May 13 |
| Carrots | Sow outdoors (fall) | Jun 28 – Aug 13 |
| Garlic | Plant outdoors (fall) | Oct 28 – Nov 28 |
Where these dates come from
ZIP code 79529 is matched to the NOAA station Haskell, TX, 29.1 km away, at 1,590 ft elevation (61 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Haskell, TX (used) | 1,590 ft | Mar 28 | Nov 7 |
| Munday, TX | 1,480 ft | Mar 26 | Nov 11 |
| Truscott 3 W, TX | 1,571 ft | Mar 28 | Nov 9 |
| Aspermont, TX | 1,670 ft | Mar 29 | Nov 7 |
Frost dates near Knox City
- O Brien, TX 79539 · last Mar 28, first Nov 7
- Rochester, TX 79544 · last Mar 28, first Nov 7
- Weinert, TX 76388 · last Mar 28, first Nov 7
- Munday, TX 76371 · last Mar 26, first Nov 11
- Benjamin, TX 79505 · last Mar 28, first Nov 9
- Rule, TX 79547 · last Mar 28, first Nov 7
- Goree, TX 76363 · last Mar 26, first Nov 11
- Haskell, TX 79521 · last Mar 28, first Nov 7
Frequently asked questions
- When is the last frost in Knox City, TX?
- For ZIP code 79529, the average last spring frost (32°F) is March 28, based on NOAA 1991-2020 climate normals for the Haskell, TX weather station. There is a 1-in-10 chance of a frost after April 14.
- When is the first frost in Knox City, TX?
- The average first fall frost (32°F) is November 7. There is a 1-in-10 chance of frost by October 25, so tender plants are at risk from that point on.
- How long is the growing season in 79529?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 225 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.