How many chill hours does 28531 get?

28531 averages 657 chill hours per winter, ranging from 469 to 883 across the last 10 years.

What hardiness zone is 28531?

28531 is in USDA hardiness zone 9a.

Location almanac

The short answer

28531 averages 657 chill hours per winter (469–883 across 10 years) in USDA zone 9a.

28531 climate
Average chill hours	657 (469–883 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically February 1 – March 13
First fall frost	typically November 29 – 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 28531’s chill hours and zone:

Chill and zone requirements are comfortably met in 28531.

Show 55 more good fit varieties

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

How many chill hours does 28531 get?: 28531 averages 657 chill hours per winter, ranging from 469 to 883 across the last 10 years.
What hardiness zone is 28531?: 28531 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