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Chill hours in T5Y

The short answer

T5Y averages 1,077 chill hours per winter (7051,302 across 10 years) in USDA zone 3b.
T5Y climate
Average chill hours1,077 (705–1,302 across 10 winters)
USDA hardiness zone3b (NRCan zone 3b)
Last spring frosttypically April 23 – May 21
First fall frosttypically September 28 – 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 T5Y’s chill hours and zone:

How many chill hours does T5Y get?
T5Y averages 1077 chill hours per winter, ranging from 705 to 1302 across the last 10 years.
What hardiness zone is T5Y?
T5Y is in USDA hardiness zone 3b.

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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