How many chill hours does 77831 get?

77831 averages 554 chill hours per winter, ranging from 234 to 744 across the last 10 years.

What hardiness zone is 77831?

77831 is in USDA hardiness zone 9a.

Location almanac

The short answer

77831 averages 554 chill hours per winter (234–744 across 10 years) in USDA zone 9a.

77831 climate
Average chill hours	554 (234–744 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically January 20 – March 6
First fall frost	typically November 1 – 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 77831’s chill hours and zone:

Chill and zone requirements are comfortably met in 77831.

Show 48 more good fit varieties

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

How many chill hours does 77831 get?: 77831 averages 554 chill hours per winter, ranging from 234 to 744 across the last 10 years.
What hardiness zone is 77831?: 77831 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