How many chill hours does 98104 get?

98104 averages 2171 chill hours per winter, ranging from 2013 to 2466 across the last 10 years.

What hardiness zone is 98104?

98104 is in USDA hardiness zone 9a.

Location almanac

The short answer

98104 averages 2,171 chill hours per winter (2,013–2,466 across 10 years) in USDA zone 9a.

98104 climate
Average chill hours	2,171 (2,013–2,466 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically March 1 – March 18
First fall frost	typically November 12 – 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 98104’s chill hours and zone:

Chill and zone requirements are comfortably met in 98104.

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How many chill hours does 98104 get?: 98104 averages 2171 chill hours per winter, ranging from 2013 to 2466 across the last 10 years.
What hardiness zone is 98104?: 98104 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