How many chill hours does 99557 get?

99557 averages 1162 chill hours per winter, ranging from 815 to 1583 across the last 10 years.

What hardiness zone is 99557?

99557 is in USDA hardiness zone 3a.

Location almanac

The short answer

99557 averages 1,162 chill hours per winter (815–1,583 across 10 years) in USDA zone 3a.

99557 climate
Average chill hours	1,162 (815–1,583 across 10 winters)
USDA hardiness zone	3a
Last spring frost	typically May 10 – May 24
First fall frost	typically September 1 – September 27

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 99557’s chill hours and zone:

Chill and zone requirements are comfortably met in 99557.

Show 41 more good fit varieties

How many chill hours does 99557 get?: 99557 averages 1162 chill hours per winter, ranging from 815 to 1583 across the last 10 years.
What hardiness zone is 99557?: 99557 is in USDA hardiness zone 3a.

Growing fruit trees in 99557? Get a care calendar anchored to this exact climate, with email reminders.

[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