How many chill hours does 99504 get?

99504 averages 1054 chill hours per winter, ranging from 772 to 1431 across the last 10 years.

What hardiness zone is 99504?

99504 is in USDA hardiness zone 5a.

Location almanac

The short answer

99504 averages 1,054 chill hours per winter (772–1,431 across 10 years) in USDA zone 5a.

99504 climate
Average chill hours	1,054 (772–1,431 across 10 winters)
USDA hardiness zone	5a
Last spring frost	typically May 16 – May 30
First fall frost	typically September 8 – October 1

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 99504’s chill hours and zone:

Chill and zone requirements are comfortably met in 99504.

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How many chill hours does 99504 get?: 99504 averages 1054 chill hours per winter, ranging from 772 to 1431 across the last 10 years.
What hardiness zone is 99504?: 99504 is in USDA hardiness zone 5a.

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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