How many chill hours does 99503 get?

99503 averages 977 chill hours per winter, ranging from 771 to 1145 across the last 10 years.

What hardiness zone is 99503?

99503 is in USDA hardiness zone 3a.

Location almanac

The short answer

99503 averages 977 chill hours per winter (771–1,145 across 10 years) in USDA zone 3a.

99503 climate
Average chill hours	977 (771–1,145 across 10 winters)
USDA hardiness zone	3a
Last spring frost	typically May 5 – May 26
First fall frost	typically September 18 – October 5

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 99503’s chill hours and zone:

Chill and zone requirements are comfortably met in 99503.

Show 41 more good fit varieties

How many chill hours does 99503 get?: 99503 averages 977 chill hours per winter, ranging from 771 to 1145 across the last 10 years.
What hardiness zone is 99503?: 99503 is in USDA hardiness zone 3a.

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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