How many chill hours does 98643 get?

98643 averages 1920 chill hours per winter, ranging from 1641 to 2322 across the last 10 years.

What hardiness zone is 98643?

98643 is in USDA hardiness zone 8b.

Location almanac

The short answer

98643 averages 1,920 chill hours per winter (1,641–2,322 across 10 years) in USDA zone 8b.

98643 climate
Average chill hours	1,920 (1,641–2,322 across 10 winters)
USDA hardiness zone	8b
Last spring frost	typically January 14 – March 25
First fall frost	typically November 26 – December 25

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 98643’s chill hours and zone:

Chill and zone requirements are comfortably met in 98643.

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How many chill hours does 98643 get?: 98643 averages 1920 chill hours per winter, ranging from 1641 to 2322 across the last 10 years.
What hardiness zone is 98643?: 98643 is in USDA hardiness zone 8b.

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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