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Chill hours in 98070

The short answer

98070 averages 2,317 chill hours per winter (2,1522,659 across 10 years) in USDA zone 9a.
98070 climate
Average chill hours2,317 (2,152–2,659 across 10 winters)
USDA hardiness zone9a
Last spring frosttypically January 11 – March 18
First fall frosttypically November 29 – 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 98070’s chill hours and zone:

How many chill hours does 98070 get?
98070 averages 2317 chill hours per winter, ranging from 2152 to 2659 across the last 10 years.
What hardiness zone is 98070?
98070 is in USDA hardiness zone 9a.

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Sources

  1. [1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
  2. [2] USDA / PRISM (Oregon State University). 2023 USDA Plant Hardiness Zone Map — accessed July 2026