Rose Harbour, British Columbia climate data is summarized below. Rose Harbour is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 21 - Nov. 30.
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |