How many chill hours does 31631 get?

31631 averages 448 chill hours per winter, ranging from 200 to 622 across the last 10 years.

What hardiness zone is 31631?

31631 is in USDA hardiness zone 9a.

Location almanac

The short answer

31631 averages 448 chill hours per winter (200–622 across 10 years) in USDA zone 9a.

31631 climate
Average chill hours	448 (200–622 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically January 19 – March 13
First fall frost	typically December 2 – December 31

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 31631’s chill hours and zone:

Chill and zone requirements are comfortably met in 31631.

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 31631 get?: 31631 averages 448 chill hours per winter, ranging from 200 to 622 across the last 10 years.
What hardiness zone is 31631?: 31631 is in USDA hardiness zone 9a.

Growing fruit trees in 31631? Get a care calendar anchored to this exact climate, with email reminders.

[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