How many chill hours does 99573 get?

99573 averages 787 chill hours per winter, ranging from 366 to 994 across the last 10 years.

What hardiness zone is 99573?

99573 is in USDA hardiness zone 4b.

Location almanac

The short answer

99573 averages 787 chill hours per winter (366–994 across 10 years) in USDA zone 4b.

99573 climate
Average chill hours	787 (366–994 across 10 winters)
USDA hardiness zone	4b
Last spring frost	typically May 16 – June 12
First fall frost	typically September 2 – September 24

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 99573’s chill hours and zone:

Chill and zone requirements are comfortably met in 99573.

Show 66 more good fit varieties

Possible in a good year or a favorable microclimate — click through for the caveats.

How many chill hours does 99573 get?: 99573 averages 787 chill hours per winter, ranging from 366 to 994 across the last 10 years.
What hardiness zone is 99573?: 99573 is in USDA hardiness zone 4b.

Growing fruit trees in 99573? 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