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Hemavan
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Growing Season: Hemavan

Storuman, Västerbotten, Sweden
-0.5°
Slight frost tomorrow at 23:00. Bring in or cover sensitive plants

Growing season

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 9 May
Daylight
10+ h
14+ h
10+ h
5 Mar
8 Apr
5 Sep
8 Oct
217 days
Frost-free
10% frost-free
7 Jun
3 Sep
90% frost risk
88 days
Effective
7 Jun
3 Sep
88 days

The growing season in Hemavan is approximately 88 days and is limited by frost.

Last spring frost

The last spring frost normally occurs on 7 Jun in Hemavan. At the earliest, the last frost is over around 21 May and at the latest around 18 Jun.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 21 May High risk Frost 9 out of 10 years after this date
25% 30 May Frost 3 out of 4 years after this date
50% 7 Jun Normal risk Frost every other year after this date
75% 13 Jun Frost 1 out of 4 years after this date
90% 18 Jun Low risk Frost 1 out of 10 years after this date
Growing is often planned around the date when there is a 50% probability that the last spring frost has occurred. In Hemavan that is 7 Jun. If you want lower frost risk, choose 75% or 90%, i.e. a later date.

First autumn frost

The first autumn frost normally occurs on 3 Sep in Hemavan. At the earliest, frost can arrive around 22 Aug and at the latest around 27 Sep.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 22 Aug Low risk Frost 1 out of 10 years on or before this date
25% 28 Aug Frost 1 out of 4 years on or before this date
50% 3 Sep Normal risk Frost every other year on or before this date
75% 21 Sep Frost 3 out of 4 years on or before this date
90% 27 Sep High risk Frost 9 out of 10 years on or before this date
Growing is often planned around the date when there is a 50% probability that the first autumn frost has occurred. In Hemavan that is 3 Sep. If you want lower frost risk, choose 10% or 25%, i.e. an earlier date.

Daylight & Persephone Period

Plants need at least 10 hours of daylight to grow actively. The period with under 10 h is called the Persephone period.

From To Number of days
Daylight over 10 h 5 Mar 8 Oct 217
Persephone period 9 Oct 4 Mar 148
Plan the year's last sowing of cold-hardy plants in Hemavan so they are approximately 75% mature by 9 Oct when daylight drops below 10 h and growth starts to slow.

Daylight periods

Long-day plants like lettuce, spinach and coriander bolt when daylight gets too long. Plan sowing and harvest during periods when daylight is shorter (10-14 h). Early spring or late summer sowing gives the best results.

Season Light Period Days Advice
Shorter daylight 10-14 h 5 Mar – 7 Apr 34 Grow long-day plants like spinach, lettuce and coriander.
Longer daylight 14+ h 8 Apr – 4 Sep 150 High risk of bolting
Shorter daylight 10-14 h 5 Sep – 8 Oct 34 Grow long-day plants