How many chill hours does 78227 get?

78227 averages 424 chill hours per winter, ranging from 235 to 528 across the last 10 years.

What hardiness zone is 78227?

78227 is in USDA hardiness zone 9a.

Location almanac

The short answer

78227 averages 424 chill hours per winter (235–528 across 10 years) in USDA zone 9a.

78227 climate
Average chill hours	424 (235–528 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 78227’s chill hours and zone:

Chill and zone requirements are comfortably met in 78227.

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 78227 get?: 78227 averages 424 chill hours per winter, ranging from 235 to 528 across the last 10 years.
What hardiness zone is 78227?: 78227 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