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Chill hours in T5R

The short answer

T5R averages 1,111 chill hours per winter (7441,359 across 10 years) in USDA zone 3b.
T5R climate
Average chill hours1,111 (744–1,359 across 10 winters)
USDA hardiness zone3b (NRCan zone 4a)
Last spring frosttypically April 26 – May 21
First fall frosttypically September 28 – October 22

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 T5R’s chill hours and zone:

How many chill hours does T5R get?
T5R averages 1111 chill hours per winter, ranging from 744 to 1359 across the last 10 years.
What hardiness zone is T5R?
T5R 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