How many chill hours does 99605 get?

99605 averages 1064 chill hours per winter, ranging from 595 to 1488 across the last 10 years.

What hardiness zone is 99605?

99605 is in USDA hardiness zone 5b.

Location almanac

The short answer

99605 averages 1,064 chill hours per winter (595–1,488 across 10 years) in USDA zone 5b.

99605 climate
Average chill hours	1,064 (595–1,488 across 10 winters)
USDA hardiness zone	5b
Last spring frost	typically May 11 – May 30
First fall frost	typically September 19 – October 10

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 99605’s chill hours and zone:

Chill and zone requirements are comfortably met in 99605.

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How many chill hours does 99605 get?: 99605 averages 1064 chill hours per winter, ranging from 595 to 1488 across the last 10 years.
What hardiness zone is 99605?: 99605 is in USDA hardiness zone 5b.

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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