How many chill hours does 98107 get?

98107 averages 2265 chill hours per winter, ranging from 2037 to 2674 across the last 10 years.

What hardiness zone is 98107?

98107 is in USDA hardiness zone 9a.

Location almanac

The short answer

98107 averages 2,265 chill hours per winter (2,037–2,674 across 10 years) in USDA zone 9a.

98107 climate
Average chill hours	2,265 (2,037–2,674 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically February 28 – March 11
First fall frost	typically November 18 – 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 98107’s chill hours and zone:

Chill and zone requirements are comfortably met in 98107.

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How many chill hours does 98107 get?: 98107 averages 2265 chill hours per winter, ranging from 2037 to 2674 across the last 10 years.
What hardiness zone is 98107?: 98107 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