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Vännäsby
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Growing Season: Vännäsby

Vännäs, Västerbotten, Sweden

Growing season

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 9 May
Daylight
10+ h
14+ h
10+ h
4 Mar
9 Apr
3 Sep
10 Oct
220 days
Frost-free
10% frost-free
1 Jun
16 Sep
90% frost risk
107 days
Effective
1 Jun
16 Sep
107 days

The growing season in Vännäsby is approximately 107 days and is limited by frost.

Last spring frost

The last spring frost normally occurs on 1 Jun in Vännäsby. At the earliest, the last frost is over around 17 May and at the latest around 13 Jun.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 17 May High risk Frost 9 out of 10 years after this date
25% 23 May Frost 3 out of 4 years after this date
50% 1 Jun Normal risk Frost every other year after this date
75% 8 Jun Frost 1 out of 4 years after this date
90% 13 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 Vännäsby that is 1 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 16 Sep in Vännäsby. At the earliest, frost can arrive around 1 Sep and at the latest around 6 Oct.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 1 Sep Low risk Frost 1 out of 10 years on or before this date
25% 5 Sep Frost 1 out of 4 years on or before this date
50% 16 Sep Normal risk Frost every other year on or before this date
75% 24 Sep Frost 3 out of 4 years on or before this date
90% 6 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 Vännäsby that is 16 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 4 Mar 10 Oct 220
Persephone period 11 Oct 3 Mar 145
Plan the year's last sowing of cold-hardy plants in Vännäsby so they are approximately 75% mature by 11 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 4 Mar – 8 Apr 36 Grow long-day plants like spinach, lettuce and coriander.
Longer daylight 14+ h 9 Apr – 2 Sep 147 High risk of bolting
Shorter daylight 10-14 h 3 Sep – 10 Oct 38 Grow long-day plants