How many chill hours does 99724 get?

99724 averages 568 chill hours per winter, ranging from 399 to 709 across the last 10 years.

What hardiness zone is 99724?

99724 is in USDA hardiness zone 1a.

Location almanac

The short answer

99724 averages 568 chill hours per winter (399–709 across 10 years) in USDA zone 1a.

99724 climate
Average chill hours	568 (399–709 across 10 winters)
USDA hardiness zone	1a
Last spring frost	typically May 3 – May 18
First fall frost	typically September 8 – 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 99724’s chill hours and zone:

Chill and zone requirements are comfortably met in 99724.

Show 3 more good fit varieties

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

How many chill hours does 99724 get?: 99724 averages 568 chill hours per winter, ranging from 399 to 709 across the last 10 years.
What hardiness zone is 99724?: 99724 is in USDA hardiness zone 1a.

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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