How many chill hours does 99620 get?

99620 averages 1138 chill hours per winter, ranging from 856 to 1374 across the last 10 years.

What hardiness zone is 99620?

99620 is in USDA hardiness zone 4a.

Location almanac

The short answer

99620 averages 1,138 chill hours per winter (856–1,374 across 10 years) in USDA zone 4a.

99620 climate
Average chill hours	1,138 (856–1,374 across 10 winters)
USDA hardiness zone	4a
Last spring frost	typically May 8 – June 2
First fall frost	typically September 24 – 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 99620’s chill hours and zone:

Chill and zone requirements are comfortably met in 99620.

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How many chill hours does 99620 get?: 99620 averages 1138 chill hours per winter, ranging from 856 to 1374 across the last 10 years.
What hardiness zone is 99620?: 99620 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