Harlingen, TX planting zone & frost dates
Harlingen is in USDA hardiness zone 10a. Frost is rare here: in most years temperatures do not drop to 32°F.
USDA hardiness zone10aavg. extreme winter low 30°F to 35°F
FrostRarein most years the nearest weather station records no 32°F freeze
Useful for zone 10a gardens
- Drip irrigation kit — saves water in long, hot seasons
- Shade cloth — protects plants from midday sun
- Soil moisture meter
- Plants for zone 10
As an Amazon Associate, FrostZoneMap earns from qualifying purchases, at no extra cost to you.
Hardiness zone by ZIP code in Harlingen
- 78550 zone 10a
- 78551 zone 10a
- 78552 zone 10a
- 78553 zone 10a
Nearby cities
- San Benito zone 10a
- Mercedes zone 10a
- Weslaco zone 10a
- Raymondville zone 10a, last frost Jan 21
- Brownsville zone 10a
- Donna zone 10a
- Alamo zone 10a
- San Juan zone 10a
Questions
What growing zone is Harlingen, TX?
Harlingen is in USDA Plant Hardiness Zone 10a (average extreme winter low 30°F to 35°F), according to the USDA 2023 map.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Harlingen, TX (USC00413943), 2.7 km (1.7 mi) from the city center, elevation 12 m, based on 27 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.