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Chill hours in T2Y

The short answer

T2Y averages 1,375 chill hours per winter (1,0171,623 across 10 years) in USDA zone 4a.
T2Y climate
Average chill hours1,375 (1,017–1,623 across 10 winters)
USDA hardiness zone4a (NRCan zone 4a)
Last spring frosttypically May 2 – May 22
First fall frosttypically September 14 – October 13

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 T2Y’s chill hours and zone:

How many chill hours does T2Y get?
T2Y averages 1375 chill hours per winter, ranging from 1017 to 1623 across the last 10 years.
What hardiness zone is T2Y?
T2Y is in USDA hardiness zone 4a.

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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