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Chill hours in J2S

The short answer

J2S averages 1,270 chill hours per winter (1,0681,591 across 10 years) in USDA zone 4b.
J2S climate
Average chill hours1,270 (1,068–1,591 across 10 winters)
USDA hardiness zone4b (NRCan zone 5b)
Last spring frosttypically April 25 – May 14
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 J2S’s chill hours and zone:

How many chill hours does J2S get?
J2S averages 1270 chill hours per winter, ranging from 1068 to 1591 across the last 10 years.
What hardiness zone is J2S?
J2S 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