Frost dates for 76941Mertzon, TX
The average last spring frost in Mertzon is April 1 and the average first fall frost is November 4, giving a typical growing season of about 215 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 1
- Average first fall frost
- Nov 4
- Growing season
- 215 days
Safer after Apr 19 (1-in-10 risk)
Possible by Oct 21 (1-in-10 risk)
First frost typically in 8 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 12 · Apr 29 | Oct 12 · Oct 26 · Nov 7 | 194 days | 100% |
| Frost / freeze (32°F) | Mar 14 · Apr 1 · Apr 19 | Oct 21 · Nov 4 · Nov 18 | 215 days | 100% |
| Hard freeze (28°F) | Mar 2 · Mar 19 · Apr 7 | Oct 29 · Nov 12 · Nov 30 | 237 days | 100% |
Planting calendar for Mertzon
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 1 – May 7 |
| Tomatoes | Transplant outdoors | Apr 17 – Jul 15 |
| Peppers | Start seeds indoors | Mar 1 – Apr 1 |
| Peppers | Transplant outdoors | May 1 – Jun 1 |
| Eggplant | Start seeds indoors | Mar 18 – Apr 16 |
| Eggplant | Transplant outdoors | May 1 – Jun 1 |
| Cucumbers | Sow outdoors | May 1 – Jul 25 |
| Summer squash | Sow outdoors | Apr 17 – Jun 1 |
| Winter squash & pumpkins | Sow outdoors | May 1 – Jun 1 |
| Snap beans | Sow outdoors | Apr 17 – Aug 17 |
| Sweet corn | Sow outdoors | Apr 17 – Jul 15 |
| Watermelon & cantaloupe | Sow outdoors | May 1 – Jun 1 |
| Okra | Sow outdoors | Apr 24 – May 17 |
| Peas | Sow outdoors (spring) | Mar 1 – Apr 16 |
| Potatoes | Plant outdoors (spring) | Mar 1 – May 1 |
| Onions | Start seeds indoors (spring) | Jan 18 – Feb 14 |
| Onions | Transplant outdoors (spring) | Mar 18 – Apr 16 |
| Broccoli | Start seeds indoors (spring) | Feb 11 – Mar 17 |
| Broccoli | Transplant outdoors (spring) | Mar 18 – Apr 16 |
| Broccoli | Start seeds indoors (fall) | Jul 5 – Jul 15 |
| Broccoli | Transplant outdoors (fall) | Aug 4 – Aug 15 |
| Cabbage | Start seeds indoors (spring) | Feb 1 – Mar 1 |
| Cabbage | Transplant outdoors (spring) | Mar 1 – Apr 1 |
| Cabbage | Start seeds indoors (fall) | Jun 25 – Jul 25 |
| Cabbage | Transplant outdoors (fall) | Jul 25 – Aug 25 |
| Leaf lettuce | Sow outdoors (spring) | Mar 1 – May 17 |
| Leaf lettuce | Sow outdoors (fall) | Jul 25 – Sep 10 |
| Spinach | Sow outdoors (spring) | Feb 22 – Apr 7 |
| Spinach | Sow outdoors (fall) | Aug 11 – Sep 15 |
| Radishes | Sow outdoors (spring) | Mar 1 – Apr 21 |
| Radishes | Sow outdoors (fall) | Jul 25 – Sep 25 |
| Kale | Sow outdoors (spring) | Mar 18 – Apr 7 |
| Kale | Sow outdoors (fall) | Jul 18 – Aug 25 |
| Carrots | Sow outdoors (spring) | Apr 1 – May 17 |
| Carrots | Sow outdoors (fall) | Jun 25 – Aug 10 |
| Garlic | Plant outdoors (fall) | Oct 25 – Nov 25 |
Where these dates come from
ZIP code 76941 is matched to the NOAA station Mertzon 12Nnw, TX, 17.9 km away, at 2,205 ft elevation (0 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Mertzon 12Nnw, TX (used) | 2,205 ft | Apr 1 | Nov 4 |
| San Angelo Wfo, TX | 1,890 ft | Mar 22 | Nov 10 |
| San Angelo, TX | 1,890 ft | Mar 20 | Nov 10 |
| Water Valley, TX | 2,115 ft | Apr 6 | Nov 2 |
Frost dates near Mertzon
- Knickerbocker, TX 76939 · last Mar 22, first Nov 10
- Christoval, TX 76935 · last Mar 22, first Nov 10
- San Angelo, TX 76904 · last Mar 20, first Nov 10
- Barnhart, TX 76930 · last Mar 20, first Nov 14
- Carlsbad, TX 76934 · last Apr 6, first Nov 2
- Water Valley, TX 76958 · last Apr 6, first Nov 2
- Goodfellow Afb, TX 76908 · last Mar 20, first Nov 10
- Wall, TX 76957 · last Mar 20, first Nov 10
Frequently asked questions
- When is the last frost in Mertzon, TX?
- For ZIP code 76941, the average last spring frost (32°F) is April 1, based on NOAA 1991-2020 climate normals for the Mertzon 12Nnw, TX weather station. There is a 1-in-10 chance of a frost after April 19.
- When is the first frost in Mertzon, TX?
- The average first fall frost (32°F) is November 4. There is a 1-in-10 chance of frost by October 21, so tender plants are at risk from that point on.
- How long is the growing season in 76941?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 215 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.