How many chill hours does 78251 get?

78251 averages 443 chill hours per winter, ranging from 239 to 554 across the last 10 years.

What hardiness zone is 78251?

78251 is in USDA hardiness zone 9a.

Location almanac

The short answer

78251 averages 443 chill hours per winter (239–554 across 10 years) in USDA zone 9a.

78251 climate
Average chill hours	443 (239–554 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically January 17 – March 6
First fall frost	typically November 12 – December 19

Computed from 10 winters of ERA5 hourly temperature (Open-Meteo, 2015–2025); zones from USDA PHZM 2023. Data updated July 3, 2026. See methodology.

Every variety in our database, checked against 78251’s chill hours and zone:

Chill and zone requirements are comfortably met in 78251.

Show 34 more good fit varieties

Possible in a good year or a favorable microclimate — click through for the caveats.

How many chill hours does 78251 get?: 78251 averages 443 chill hours per winter, ranging from 239 to 554 across the last 10 years.
What hardiness zone is 78251?: 78251 is in USDA hardiness zone 9a.

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[1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
[2] USDA / PRISM (Oregon State University). 2023 USDA Plant Hardiness Zone Map — accessed July 2026