How many chill hours does 99683 get?

99683 averages 1066 chill hours per winter, ranging from 600 to 1389 across the last 10 years.

What hardiness zone is 99683?

99683 is in USDA hardiness zone 4b.

Location almanac

The short answer

99683 averages 1,066 chill hours per winter (600–1,389 across 10 years) in USDA zone 4b.

99683 climate
Average chill hours	1,066 (600–1,389 across 10 winters)
USDA hardiness zone	4b
Last spring frost	typically May 6 – May 25
First fall frost	typically September 22 – October 14

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 99683’s chill hours and zone:

Chill and zone requirements are comfortably met in 99683.

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How many chill hours does 99683 get?: 99683 averages 1066 chill hours per winter, ranging from 600 to 1389 across the last 10 years.
What hardiness zone is 99683?: 99683 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