Morro Bay, CA planting zone & frost dates
Morro Bay is in USDA hardiness zone 10a. Frost is rare here: in most years temperatures do not drop to 32°F.
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 Morro Bay
- 93442 zone 9b
- 93443 zone 10a
Nearby cities
- Los Osos zone 10a
- San Luis Obispo zone 10a, last frost Jan 16
- Atascadero zone 9a, last frost Mar 15
- Paso Robles zone 9a, last frost Mar 15
- Grover Beach zone 10a
- Arroyo Grande zone 10a
- Nipomo zone 9b, last frost Feb 4
- Santa Maria zone 9b, last frost Feb 4
Questions
What growing zone is Morro Bay, CA?
Morro Bay is in USDA Plant Hardiness Zone 10a (average extreme winter low 30°F to 35°F), according to the USDA 2023 map. Some ZIP codes of the city fall in zone 9b.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Morro Bay Fire Dept, CA (USC00045866), 0.5 km (0.3 mi) from the city center, elevation 36 m, based on 18 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.