How many chill hours does 99554 get?

99554 averages 1198 chill hours per winter, ranging from 825 to 1417 across the last 10 years.

What hardiness zone is 99554?

99554 is in USDA hardiness zone 4a.

Location almanac

The short answer

99554 averages 1,198 chill hours per winter (825–1,417 across 10 years) in USDA zone 4a.

99554 climate
Average chill hours	1,198 (825–1,417 across 10 winters)
USDA hardiness zone	4a
Last spring frost	typically May 8 – June 3
First fall frost	typically September 25 – 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 99554’s chill hours and zone:

Chill and zone requirements are comfortably met in 99554.

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How many chill hours does 99554 get?: 99554 averages 1198 chill hours per winter, ranging from 825 to 1417 across the last 10 years.
What hardiness zone is 99554?: 99554 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