How many chill hours does 99623 get?

99623 averages 1121 chill hours per winter, ranging from 673 to 1551 across the last 10 years.

What hardiness zone is 99623?

99623 is in USDA hardiness zone 4b.

Location almanac

The short answer

99623 averages 1,121 chill hours per winter (673–1,551 across 10 years) in USDA zone 4b.

99623 climate
Average chill hours	1,121 (673–1,551 across 10 winters)
USDA hardiness zone	4b
Last spring frost	typically April 28 – May 8
First fall frost	typically September 22 – October 17

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 99623’s chill hours and zone:

Chill and zone requirements are comfortably met in 99623.

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How many chill hours does 99623 get?: 99623 averages 1121 chill hours per winter, ranging from 673 to 1551 across the last 10 years.
What hardiness zone is 99623?: 99623 is in USDA hardiness zone 4b.

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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