How many chill hours does 78661 get?

78661 averages 457 chill hours per winter, ranging from 224 to 593 across the last 10 years.

What hardiness zone is 78661?

78661 is in USDA hardiness zone 9a.

Location almanac

The short answer

78661 averages 457 chill hours per winter (224–593 across 10 years) in USDA zone 9a.

78661 climate
Average chill hours	457 (224–593 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically January 20 – 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 78661’s chill hours and zone:

Chill and zone requirements are comfortably met in 78661.

Show 36 more good fit varieties

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

How many chill hours does 78661 get?: 78661 averages 457 chill hours per winter, ranging from 224 to 593 across the last 10 years.
What hardiness zone is 78661?: 78661 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