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Chill hours in P0R

The short answer

P0R averages 1,102 chill hours per winter (8641,368 across 10 years) in USDA zone 4b.
P0R climate
Average chill hours1,102 (864–1,368 across 10 winters)
USDA hardiness zone4b (NRCan zone 4b)
Last spring frosttypically April 30 – May 19
First fall frosttypically October 12 – October 29

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 P0R’s chill hours and zone:

How many chill hours does P0R get?
P0R averages 1102 chill hours per winter, ranging from 864 to 1368 across the last 10 years.
What hardiness zone is P0R?
P0R is in USDA hardiness zone 4b.

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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