How many chill hours does 77320 get?

77320 averages 544 chill hours per winter, ranging from 228 to 706 across the last 10 years.

What hardiness zone is 77320?

77320 is in USDA hardiness zone 9a.

Location almanac

The short answer

77320 averages 544 chill hours per winter (228–706 across 10 years) in USDA zone 9a.

77320 climate
Average chill hours	544 (228–706 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically January 21 – March 6
First fall frost	typically November 12 – December 22

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 77320’s chill hours and zone:

Chill and zone requirements are comfortably met in 77320.

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 77320 get?: 77320 averages 544 chill hours per winter, ranging from 228 to 706 across the last 10 years.
What hardiness zone is 77320?: 77320 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