How many chill hours does 31401 get?

31401 averages 517 chill hours per winter, ranging from 298 to 647 across the last 10 years.

What hardiness zone is 31401?

31401 is in USDA hardiness zone 9a.

Location almanac

The short answer

31401 averages 517 chill hours per winter (298–647 across 10 years) in USDA zone 9a.

31401 climate
Average chill hours	517 (298–647 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically January 20 – March 13
First fall frost	typically November 13 – December 24

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 31401’s chill hours and zone:

Chill and zone requirements are comfortably met in 31401.

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 31401 get?: 31401 averages 517 chill hours per winter, ranging from 298 to 647 across the last 10 years.
What hardiness zone is 31401?: 31401 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