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Chill hours in K2K

The short answer

K2K averages 1,309 chill hours per winter (1,0271,673 across 10 years) in USDA zone 4b.
K2K climate
Average chill hours1,309 (1,027–1,673 across 10 winters)
USDA hardiness zone4b (NRCan zone 5b)
Last spring frosttypically April 27 – May 10
First fall frosttypically October 18 – November 4

Computed from 10 winters of ERA5 hourly temperature (Open-Meteo, 2015–2025); zones from USDA PHZM 2023 / NRCan 1981–2010. Data updated July 3, 2026. See methodology.

Every variety in our database, checked against K2K’s chill hours and zone:

How many chill hours does K2K get?
K2K averages 1309 chill hours per winter, ranging from 1027 to 1673 across the last 10 years.
What hardiness zone is K2K?
K2K is in USDA hardiness zone 4b.

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Sources

  1. [1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
  2. [2] Natural Resources Canada. Plant Hardiness Zones of Canada — accessed July 2026