How many chill hours does 99559 get?

99559 averages 1302 chill hours per winter, ranging from 817 to 1609 across the last 10 years.

What hardiness zone is 99559?

99559 is in USDA hardiness zone 4a.

Location almanac

The short answer

99559 averages 1,302 chill hours per winter (817–1,609 across 10 years) in USDA zone 4a.

99559 climate
Average chill hours	1,302 (817–1,609 across 10 winters)
USDA hardiness zone	4a
Last spring frost	typically May 4 – May 18
First fall frost	typically September 21 – October 11

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 99559’s chill hours and zone:

Chill and zone requirements are comfortably met in 99559.

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How many chill hours does 99559 get?: 99559 averages 1302 chill hours per winter, ranging from 817 to 1609 across the last 10 years.
What hardiness zone is 99559?: 99559 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