How many chill hours does 77703 get?

77703 averages 430 chill hours per winter, ranging from 189 to 553 across the last 10 years.

What hardiness zone is 77703?

77703 is in USDA hardiness zone 9a.

Location almanac

The short answer

77703 averages 430 chill hours per winter (189–553 across 10 years) in USDA zone 9a.

77703 climate
Average chill hours	430 (189–553 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically January 8 – February 20
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 77703’s chill hours and zone:

Chill and zone requirements are comfortably met in 77703.

Show 34 more good fit varieties

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

How many chill hours does 77703 get?: 77703 averages 430 chill hours per winter, ranging from 189 to 553 across the last 10 years.
What hardiness zone is 77703?: 77703 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