Frost dates for Hillsboro, TX
At Hillsboro, the median last spring frost (32°F) is Mar 21 and the median first fall frost is Nov 10, for a typical growing season of 235 days. For a 90% chance that the last frost has passed, wait until Apr 8. Nearby ZIP codes are in USDA hardiness zone 8b.
- Mar 21Last spring frost (median)50% chance of 32°F after this date
- Apr 8Safer planting date10% chance of 32°F after this date
- Nov 10First fall frost (median)50% chance of 32°F by this date
- 235 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | Mar 14 | Apr 2 | Apr 19 |
| 32°F | Mar 2 | Mar 21 | Apr 8 |
| 28°F | Feb 17 | Mar 9 | Mar 29 |
| 24°F | Jan 29 | Feb 26 | Mar 17 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Oct 21 | Nov 3 | Nov 17 |
| 32°F | Oct 28 | Nov 10 | Nov 29 |
| 28°F | Nov 2 | Nov 22 | Dec 14 |
| 24°F | Nov 13 | Dec 4 | Jan 5 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 190 days | 213 days | 236 days |
| 32°F | 209 days | 235 days | 261 days |
| 28°F | 231 days | 257 days | 286 days |
| 24°F | 253 days | 287 days | 323 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 76645 | 8b | 15 to 20°F | 2 km |
| 76628 | 8b | 15 to 20°F | 13 km |
| 76631 | 8b | 15 to 20°F | 14 km |
| 76621 | 8b | 15 to 20°F | 16 km |
| 76055 | 8b | 15 to 20°F | 16 km |
| 76670 | 8b | 15 to 20°F | 18 km |
| 76666 | 8b | 15 to 20°F | 20 km |
| 76676 | 8b | 15 to 20°F | 21 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00414182, at 32.0161, -97.1094, elevation 168 m (550 ft).
- Data quality: Standard (24+ years of data), 27 years of freeze data.
- Average days per year at or below 32°F: 37.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Whitney Dam (30 km)
- Navarro Mills Dam (40 km)
- Cleburne (43 km)
- Waco Regional Airport (46 km)
- Waco Dam (47 km)
- Waxahachie (52 km)
- Bardwell Dam (52 km)
- Burleson (59 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.