How many chill hours does 99023 get?

99023 averages 1886 chill hours per winter, ranging from 1380 to 2286 across the last 10 years.

What hardiness zone is 99023?

99023 is in USDA hardiness zone 6b.

Location almanac

The short answer

99023 averages 1,886 chill hours per winter (1,380–2,286 across 10 years) in USDA zone 6b.

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 99023’s chill hours and zone:

Chill and zone requirements are comfortably met in 99023.

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How many chill hours does 99023 get?: 99023 averages 1886 chill hours per winter, ranging from 1380 to 2286 across the last 10 years.
What hardiness zone is 99023?: 99023 is in USDA hardiness zone 6b.

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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