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Chill hours in T1R

The short answer

T1R averages 1,324 chill hours per winter (1,0041,568 across 10 years) in USDA zone 4a.
T1R climate
Average chill hours1,324 (1,004–1,568 across 10 winters)
USDA hardiness zone4a (NRCan zone 3b)
Last spring frosttypically April 24 – May 15
First fall frosttypically September 28 – October 24

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 T1R’s chill hours and zone:

How many chill hours does T1R get?
T1R averages 1324 chill hours per winter, ranging from 1004 to 1568 across the last 10 years.
What hardiness zone is T1R?
T1R 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