How many chill hours does 99606 get?

99606 averages 1714 chill hours per winter, ranging from 1024 to 2671 across the last 10 years.

What hardiness zone is 99606?

99606 is in USDA hardiness zone 4b.

Location almanac

The short answer

99606 averages 1,714 chill hours per winter (1,024–2,671 across 10 years) in USDA zone 4b.

99606 climate
Average chill hours	1,714 (1,024–2,671 across 10 winters)
USDA hardiness zone	4b
Last spring frost	typically April 28 – May 16
First fall frost	typically September 28 – October 16

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 99606’s chill hours and zone:

Chill and zone requirements are comfortably met in 99606.

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How many chill hours does 99606 get?: 99606 averages 1714 chill hours per winter, ranging from 1024 to 2671 across the last 10 years.
What hardiness zone is 99606?: 99606 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