How many chill hours does 28657 get?

28657 averages 1601 chill hours per winter, ranging from 1333 to 1929 across the last 10 years.

What hardiness zone is 28657?

28657 is in USDA hardiness zone 6b.

Location almanac

The short answer

28657 averages 1,601 chill hours per winter (1,333–1,929 across 10 years) in USDA zone 6b.

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 28657’s chill hours and zone:

Chill and zone requirements are comfortably met in 28657.

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How many chill hours does 28657 get?: 28657 averages 1601 chill hours per winter, ranging from 1333 to 1929 across the last 10 years.
What hardiness zone is 28657?: 28657 is in USDA hardiness zone 6b.

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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