How many chill hours does 78503 get?

78503 averages 133 chill hours per winter, ranging from 59 to 207 across the last 10 years.

What hardiness zone is 78503?

78503 is in USDA hardiness zone 10a.

Location almanac

The short answer

78503 averages 133 chill hours per winter (59–207 across 10 years) in USDA zone 10a.

78503 climate
Average chill hours	133 (59–207 across 10 winters)
USDA hardiness zone	10a

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 78503’s chill hours and zone:

Chill and zone requirements are comfortably met in 78503.

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

How many chill hours does 78503 get?: 78503 averages 133 chill hours per winter, ranging from 59 to 207 across the last 10 years.
What hardiness zone is 78503?: 78503 is in USDA hardiness zone 10a.

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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