How many chill hours does 99658 get?

99658 averages 1139 chill hours per winter, ranging from 843 to 1394 across the last 10 years.

What hardiness zone is 99658?

99658 is in USDA hardiness zone 4a.

Location almanac

The short answer

99658 averages 1,139 chill hours per winter (843–1,394 across 10 years) in USDA zone 4a.

99658 climate
Average chill hours	1,139 (843–1,394 across 10 winters)
USDA hardiness zone	4a
Last spring frost	typically May 7 – May 31
First fall frost	typically September 23 – 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 99658’s chill hours and zone:

Chill and zone requirements are comfortably met in 99658.

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How many chill hours does 99658 get?: 99658 averages 1139 chill hours per winter, ranging from 843 to 1394 across the last 10 years.
What hardiness zone is 99658?: 99658 is in USDA hardiness zone 4a.

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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