How many chill hours does 98641 get?

98641 averages 1735 chill hours per winter, ranging from 1469 to 2203 across the last 10 years.

What hardiness zone is 98641?

98641 is in USDA hardiness zone 9a.

Location almanac

The short answer

98641 averages 1,735 chill hours per winter (1,469–2,203 across 10 years) in USDA zone 9a.

98641 climate
Average chill hours	1,735 (1,469–2,203 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically January 3 – March 11
First fall frost	typically November 29 – December 27

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 98641’s chill hours and zone:

Chill and zone requirements are comfortably met in 98641.

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How many chill hours does 98641 get?: 98641 averages 1735 chill hours per winter, ranging from 1469 to 2203 across the last 10 years.
What hardiness zone is 98641?: 98641 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