Frost dates for 76645Hillsboro, TX
The average last spring frost in Hillsboro is March 21 and the average first fall frost is November 10, giving a typical growing season of about 235 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 21
- Average first fall frost
- Nov 10
- Growing season
- 235 days
Safer after Apr 8 (1-in-10 risk)
Possible by Oct 28 (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 14 · Apr 2 · Apr 19 | Oct 21 · Nov 3 · Nov 17 | 213 days | 100% |
| Frost / freeze (32°F) | Mar 2 · Mar 21 · Apr 8 | Oct 28 · Nov 10 · Nov 29 | 235 days | 100% |
| Hard freeze (28°F) | Feb 17 · Mar 9 · Mar 29 | Nov 2 · Nov 22 · Dec 14 | 257 days | 100% |
Planting calendar for Hillsboro
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 18 – Apr 26 |
| Tomatoes | Transplant outdoors | Apr 6 – Jul 21 |
| Peppers | Start seeds indoors | Feb 18 – Mar 21 |
| Peppers | Transplant outdoors | Apr 20 – May 21 |
| Eggplant | Start seeds indoors | Mar 7 – Apr 5 |
| Eggplant | Transplant outdoors | Apr 20 – May 21 |
| Cucumbers | Sow outdoors | Apr 20 – Jul 31 |
| Summer squash | Sow outdoors | Apr 6 – May 21 |
| Winter squash & pumpkins | Sow outdoors | Apr 20 – May 21 |
| Snap beans | Sow outdoors | Apr 6 – Aug 23 |
| Sweet corn | Sow outdoors | Apr 6 – Jul 21 |
| Watermelon & cantaloupe | Sow outdoors | Apr 20 – May 21 |
| Okra | Sow outdoors | Apr 13 – May 6 |
| Peas | Sow outdoors (spring) | Feb 18 – Apr 5 |
| Potatoes | Plant outdoors (spring) | Feb 18 – Apr 20 |
| Onions | Start seeds indoors (spring) | Jan 7 – Feb 3 |
| Onions | Transplant outdoors (spring) | Mar 7 – Apr 5 |
| Broccoli | Start seeds indoors (spring) | Jan 31 – Mar 6 |
| Broccoli | Transplant outdoors (spring) | Mar 7 – Apr 5 |
| Broccoli | Start seeds indoors (fall) | Jul 11 – Jul 21 |
| Broccoli | Transplant outdoors (fall) | Aug 10 – Aug 21 |
| Cabbage | Start seeds indoors (spring) | Jan 21 – Feb 18 |
| Cabbage | Transplant outdoors (spring) | Feb 18 – Mar 21 |
| Cabbage | Start seeds indoors (fall) | Jul 1 – Jul 31 |
| Cabbage | Transplant outdoors (fall) | Jul 31 – Aug 31 |
| Leaf lettuce | Sow outdoors (spring) | Feb 18 – May 6 |
| Leaf lettuce | Sow outdoors (fall) | Jul 31 – Sep 16 |
| Spinach | Sow outdoors (spring) | Feb 11 – Mar 27 |
| Spinach | Sow outdoors (fall) | Aug 17 – Sep 21 |
| Radishes | Sow outdoors (spring) | Feb 18 – Apr 10 |
| Radishes | Sow outdoors (fall) | Jul 31 – Oct 1 |
| Kale | Sow outdoors (spring) | Mar 7 – Mar 27 |
| Kale | Sow outdoors (fall) | Jul 24 – Aug 31 |
| Carrots | Sow outdoors (spring) | Mar 21 – May 6 |
| Carrots | Sow outdoors (fall) | Jul 1 – Aug 16 |
| Garlic | Plant outdoors (fall) | Oct 31 – Dec 1 |
Where these dates come from
ZIP code 76645 is matched to the NOAA station Hillsboro, TX, 1 km away, at 550 ft elevation (83 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Hillsboro, TX (used) | 550 ft | Mar 21 | Nov 10 |
| Whitney Dam, TX | 574 ft | Mar 15 | Nov 14 |
| Navarro Mills Dam, TX | 454 ft | Mar 13 | Nov 14 |
| Cleburne, TX | 783 ft | Mar 17 | Nov 12 |
Frost dates near Hillsboro
- Bynum, TX 76631 · last Mar 21, first Nov 10
- Abbott, TX 76621 · last Mar 21, first Nov 10
- Brandon, TX 76628 · last Mar 21, first Nov 10
- Itasca, TX 76055 · last Mar 21, first Nov 10
- Aquilla, TX 76622 · last Mar 15, first Nov 14
- Covington, TX 76636 · last Mar 17, first Nov 12
- Mertens, TX 76666 · last Mar 21, first Nov 10
- Milford, TX 76670 · last Mar 21, first Nov 10
Frequently asked questions
- When is the last frost in Hillsboro, TX?
- For ZIP code 76645, the average last spring frost (32°F) is March 21, based on NOAA 1991-2020 climate normals for the Hillsboro, TX weather station. There is a 1-in-10 chance of a frost after April 8.
- When is the first frost in Hillsboro, TX?
- The average first fall frost (32°F) is November 10. There is a 1-in-10 chance of frost by October 28, so tender plants are at risk from that point on.
- How long is the growing season in 76645?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 235 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.