How many chill hours does 77099 get?

77099 averages 392 chill hours per winter, ranging from 164 to 498 across the last 10 years.

What hardiness zone is 77099?

77099 is in USDA hardiness zone 9b.

Location almanac

The short answer

77099 averages 392 chill hours per winter (164–498 across 10 years) in USDA zone 9b.

77099 climate
Average chill hours	392 (164–498 across 10 winters)
USDA hardiness zone	9b
Last spring frost	typically January 18 – February 27
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 77099’s chill hours and zone:

Chill and zone requirements are comfortably met in 77099.

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 77099 get?: 77099 averages 392 chill hours per winter, ranging from 164 to 498 across the last 10 years.
What hardiness zone is 77099?: 77099 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