How many chill hours does 77521 get?

77521 averages 386 chill hours per winter, ranging from 171 to 494 across the last 10 years.

What hardiness zone is 77521?

77521 is in USDA hardiness zone 9b.

Location almanac

The short answer

77521 averages 386 chill hours per winter (171–494 across 10 years) in USDA zone 9b.

77521 climate
Average chill hours	386 (171–494 across 10 winters)
USDA hardiness zone	9b
Last spring frost	typically January 18 – February 26
First fall frost	typically November 13 – 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 77521’s chill hours and zone:

Chill and zone requirements are comfortably met in 77521.

Show 26 more good fit varieties

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

How many chill hours does 77521 get?: 77521 averages 386 chill hours per winter, ranging from 171 to 494 across the last 10 years.
What hardiness zone is 77521?: 77521 is in USDA hardiness zone 9b.

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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