How many chill hours does 99680 get?

99680 averages 1340 chill hours per winter, ranging from 805 to 1663 across the last 10 years.

What hardiness zone is 99680?

99680 is in USDA hardiness zone 4a.

Location almanac

The short answer

99680 averages 1,340 chill hours per winter (805–1,663 across 10 years) in USDA zone 4a.

99680 climate
Average chill hours	1,340 (805–1,663 across 10 winters)
USDA hardiness zone	4a
Last spring frost	typically April 27 – May 20
First fall frost	typically September 22 – October 15

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 99680’s chill hours and zone:

Chill and zone requirements are comfortably met in 99680.

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How many chill hours does 99680 get?: 99680 averages 1340 chill hours per winter, ranging from 805 to 1663 across the last 10 years.
What hardiness zone is 99680?: 99680 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