How many chill hours does 99923 get?

99923 averages 1440 chill hours per winter, ranging from 844 to 1865 across the last 10 years.

What hardiness zone is 99923?

99923 is in USDA hardiness zone 6b.

Location almanac

The short answer

99923 averages 1,440 chill hours per winter (844–1,865 across 10 years) in USDA zone 6b.

99923 climate
Average chill hours	1,440 (844–1,865 across 10 winters)
USDA hardiness zone	6b
Last spring frost	typically May 5 – May 30
First fall frost	typically September 24 – October 21

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 99923’s chill hours and zone:

Chill and zone requirements are comfortably met in 99923.

Show 126 more good fit varieties

How many chill hours does 99923 get?: 99923 averages 1440 chill hours per winter, ranging from 844 to 1865 across the last 10 years.
What hardiness zone is 99923?: 99923 is in USDA hardiness zone 6b.

Growing fruit trees in 99923? 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