Fontana, CA planting zone & frost dates
Fontana 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
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Hardiness zone by ZIP code in Fontana
- 92331 zone 10a
- 92334 zone 10a
- 92335 zone 10a
- 92336 zone 10a
- 92337 zone 10a
Nearby cities
- Bloomington zone 10a
- Rialto zone 10a
- Glen Avon zone 10a
- Rubidoux zone 10a
- Muscoy zone 10a, last frost Jan 27
- Colton zone 10a, last frost Jan 27
- Pedley zone 10a
- Jurupa Valley zone 10a
Questions
What growing zone is Fontana, CA?
Fontana 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 Riverside Citrus Exp, CA (USC00047473), 15.5 km (9.6 mi) from the city center, elevation 300 m, based on 17 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.