How many chill hours does 99563 get?

99563 averages 1238 chill hours per winter, ranging from 825 to 1481 across the last 10 years.

What hardiness zone is 99563?

99563 is in USDA hardiness zone 4a.

Location almanac

The short answer

99563 averages 1,238 chill hours per winter (825–1,481 across 10 years) in USDA zone 4a.

99563 climate
Average chill hours	1,238 (825–1,481 across 10 winters)
USDA hardiness zone	4a
Last spring frost	typically May 8 – May 31
First fall frost	typically September 23 – 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 99563’s chill hours and zone:

Chill and zone requirements are comfortably met in 99563.

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How many chill hours does 99563 get?: 99563 averages 1238 chill hours per winter, ranging from 825 to 1481 across the last 10 years.
What hardiness zone is 99563?: 99563 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