How many chill hours does 78203 get?

78203 averages 419 chill hours per winter, ranging from 235 to 522 across the last 10 years.

What hardiness zone is 78203?

78203 is in USDA hardiness zone 9a.

Location almanac

The short answer

78203 averages 419 chill hours per winter (235–522 across 10 years) in USDA zone 9a.

78203 climate
Average chill hours	419 (235–522 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically January 17 – March 6
First fall frost	typically November 12 – December 23

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 78203’s chill hours and zone:

Chill and zone requirements are comfortably met in 78203.

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 78203 get?: 78203 averages 419 chill hours per winter, ranging from 235 to 522 across the last 10 years.
What hardiness zone is 78203?: 78203 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