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Chill hours in T4V

The short answer

T4V averages 1,056 chill hours per winter (6591,365 across 10 years) in USDA zone 3b.
T4V climate
Average chill hours1,056 (659–1,365 across 10 winters)
USDA hardiness zone3b (NRCan zone 3a)
Last spring frosttypically April 24 – May 21
First fall frosttypically September 28 – October 10

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 T4V’s chill hours and zone:

How many chill hours does T4V get?
T4V averages 1056 chill hours per winter, ranging from 659 to 1365 across the last 10 years.
What hardiness zone is T4V?
T4V 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