How many chill hours does 99155 get?

99155 averages 1450 chill hours per winter, ranging from 912 to 1755 across the last 10 years.

What hardiness zone is 99155?

99155 is in USDA hardiness zone 6b.

Location almanac

The short answer

99155 averages 1,450 chill hours per winter (912–1,755 across 10 years) in USDA zone 6b.

99155 climate
Average chill hours	1,450 (912–1,755 across 10 winters)
USDA hardiness zone	6b
Last spring frost	typically April 25 – June 11
First fall frost	typically September 29 – October 22

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 99155’s chill hours and zone:

Chill and zone requirements are comfortably met in 99155.

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How many chill hours does 99155 get?: 99155 averages 1450 chill hours per winter, ranging from 912 to 1755 across the last 10 years.
What hardiness zone is 99155?: 99155 is in USDA hardiness zone 6b.

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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