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Chill hours in 98297

The short answer

98297 averages 2,344 chill hours per winter (1,6262,750 across 10 years) in USDA zone 9a.
98297 climate
Average chill hours2,344 (1,626–2,750 across 10 winters)
USDA hardiness zone9a
Last spring frosttypically February 14 – March 10
First fall frosttypically November 8 – December 20

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 98297’s chill hours and zone:

How many chill hours does 98297 get?
98297 averages 2344 chill hours per winter, ranging from 1626 to 2750 across the last 10 years.
What hardiness zone is 98297?
98297 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