How many chill hours does 77451 get?

77451 averages 383 chill hours per winter, ranging from 148 to 499 across the last 10 years.

What hardiness zone is 77451?

77451 is in USDA hardiness zone 9a.

Location almanac

The short answer

77451 averages 383 chill hours per winter (148–499 across 10 years) in USDA zone 9a.

77451 climate
Average chill hours	383 (148–499 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically January 8 – February 20
First fall frost	typically November 13 – December 20

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 77451’s chill hours and zone:

Chill and zone requirements are comfortably met in 77451.

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 77451 get?: 77451 averages 383 chill hours per winter, ranging from 148 to 499 across the last 10 years.
What hardiness zone is 77451?: 77451 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