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Bredviken
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Growing Season: Bredviken

Storuman, Västerbotten, Sweden
-0.6°
Slight frost tomorrow at 23:00. Frost temperatures between tomorrow 22:00 – 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
6 Mar
7 Apr
5 Sep
8 Oct
216 days
Frost-free
10% frost-free
4 Jun
28 Sep
90% frost risk
116 days
Effective
4 Jun
28 Sep
116 days

The growing season in Bredviken is approximately 116 days and is limited by frost.

Last spring frost

The last spring frost normally occurs on 4 Jun in Bredviken. At the earliest, the last frost is over around 20 May and at the latest around 18 Jun.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 20 May High risk Frost 9 out of 10 years after this date
25% 25 May Frost 3 out of 4 years after this date
50% 4 Jun Normal risk Frost every other year after this date
75% 10 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 Bredviken that is 4 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 28 Sep in Bredviken. At the earliest, frost can arrive around 30 Aug and at the latest around 9 Oct.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 30 Aug Low risk Frost 1 out of 10 years on or before this date
25% 16 Sep Frost 1 out of 4 years on or before this date
50% 28 Sep Normal risk Frost every other year on or before this date
75% 4 Oct Frost 3 out of 4 years on or before this date
90% 9 Oct 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 Bredviken that is 28 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 6 Mar 8 Oct 216
Persephone period 9 Oct 5 Mar 149
Plan the year's last sowing of cold-hardy plants in Bredviken 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 6 Mar – 6 Apr 32 Grow long-day plants like spinach, lettuce and coriander.
Longer daylight 14+ h 7 Apr – 4 Sep 151 High risk of bolting
Shorter daylight 10-14 h 5 Sep – 8 Oct 34 Grow long-day plants