How many chill hours does 28553 get?

28553 averages 653 chill hours per winter, ranging from 456 to 881 across the last 10 years.

What hardiness zone is 28553?

28553 is in USDA hardiness zone 9a.

Location almanac

The short answer

28553 averages 653 chill hours per winter (456–881 across 10 years) in USDA zone 9a.

28553 climate
Average chill hours	653 (456–881 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 28553’s chill hours and zone:

Chill and zone requirements are comfortably met in 28553.

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 28553 get?: 28553 averages 653 chill hours per winter, ranging from 456 to 881 across the last 10 years.
What hardiness zone is 28553?: 28553 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