Frost Dates for Tromso, Troms, Norway

Coordinates: 69.667, 18.967

Growing Season

The last spring air frost in Tromso, Troms, Norway typically occurs around Jun 1, and the first autumn air frost around Aug 31. This gives a frost-free growing season of approximately 91 days.

USDA Hardiness Zone

This location falls in USDA Hardiness Zone 6b, where the average annual extreme minimum temperature is -20.6 to -17.8°C (-5 to 0°F). This zone rating helps gardeners determine which perennial plants are likely to survive winter.

Temperature Overview

The coldest month is January, with an average low of -10°C (14°F). The warmest month is July, with an average high of 15°C (59°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): Jun 1 (last spring) to Aug 31 (first autumn). Light ground frost (-1°C / 30°F): May 19 (last spring) to Sep 13 (first autumn). Hard ground frost (-2°C / 28°F): Apr 30 (last spring) to Sep 30 (first autumn).

We predict your growing zone to be approximately ...

USDA Growing Zone: USDA Growing Zone - 6b

... and the frost data for your area is ...

Current Risk Level: Light Ground Frost possible

for today based on past data only.

We predict a frost free growing season at your location from Jun 1 to Aug 31, which provides approximately 90 frost free days.

For the less tender plants, or if you are planning to protect your plants with fleece etc, your growing season could stretch from May 19 to Sep 13, which provides a total of 117 days for growing.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec