How many chill hours does 31788 get?

31788 averages 512 chill hours per winter, ranging from 262 to 639 across the last 10 years.

What hardiness zone is 31788?

31788 is in USDA hardiness zone 9a.

Location almanac

The short answer

31788 averages 512 chill hours per winter (262–639 across 10 years) in USDA zone 9a.

31788 climate
Average chill hours	512 (262–639 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically January 16 – March 6
First fall frost	typically December 3 – 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 31788’s chill hours and zone:

Chill and zone requirements are comfortably met in 31788.

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 31788 get?: 31788 averages 512 chill hours per winter, ranging from 262 to 639 across the last 10 years.
What hardiness zone is 31788?: 31788 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