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Tvärålund
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Growing Season: Tvärålund

Vindeln, 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
9 Oct
219 days
Frost-free
10% frost-free
5 Jun
2 Sep
90% frost risk
89 days
Effective
5 Jun
2 Sep
89 days

The growing season in Tvärålund is approximately 89 days and is limited by frost.

Last spring frost

The last spring frost normally occurs on 5 Jun in Tvärålund. At the earliest, the last frost is over around 22 May and at the latest around 18 Jun.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 22 May High risk Frost 9 out of 10 years after this date
25% 28 May Frost 3 out of 4 years after this date
50% 5 Jun Normal risk Frost every other year after this date
75% 11 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 Tvärålund that is 5 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 2 Sep in Tvärålund. At the earliest, frost can arrive around 17 Aug and at the latest around 18 Sep.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 17 Aug Low risk Frost 1 out of 10 years on or before this date
25% 25 Aug Frost 1 out of 4 years on or before this date
50% 2 Sep Normal risk Frost every other year on or before this date
75% 10 Sep Frost 3 out of 4 years on or before this date
90% 18 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 Tvärålund that is 2 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 9 Oct 219
Persephone period 10 Oct 3 Mar 146
Plan the year's last sowing of cold-hardy plants in Tvärålund so they are approximately 75% mature by 10 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 – 9 Oct 37 Grow long-day plants