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Chill hours in J6Z

The short answer

J6Z averages 1,255 chill hours per winter (1,0871,637 across 10 years) in USDA zone 4b.
J6Z climate
Average chill hours1,255 (1,087–1,637 across 10 winters)
USDA hardiness zone4b (NRCan zone 5b)
Last spring frosttypically April 25 – May 9
First fall frosttypically October 18 – November 3

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 J6Z’s chill hours and zone:

How many chill hours does J6Z get?
J6Z averages 1255 chill hours per winter, ranging from 1087 to 1637 across the last 10 years.
What hardiness zone is J6Z?
J6Z 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