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Chill hours in T4R

The short answer

T4R averages 1,137 chill hours per winter (7901,417 across 10 years) in USDA zone 3b.
T4R climate
Average chill hours1,137 (790–1,417 across 10 winters)
USDA hardiness zone3b (NRCan zone 3b)
Last spring frosttypically April 29 – May 22
First fall frosttypically September 28 – October 14

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 T4R’s chill hours and zone:

How many chill hours does T4R get?
T4R averages 1137 chill hours per winter, ranging from 790 to 1417 across the last 10 years.
What hardiness zone is T4R?
T4R 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