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Læsø
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Growing Season: Læsø

Læso Kommune, North Jutland, Denmark

Growing season

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 20 Apr
Daylight
10+ h
14+ h
10+ h
26 Feb
15 Apr
29 Aug
16 Oct
232 days
Frost-free
10% frost-free
26 Mar
26 Nov
90% frost risk
245 days
Effective
26 Mar
16 Oct
204 days

The growing season in Læsø is approximately 204 days and is limited by both frost and daylight.

Last spring frost

The last spring frost normally occurs on 26 Mar in Læsø. At the earliest, the last frost is over around 26 Feb and at the latest around 10 Apr.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 26 Feb High risk Frost 9 out of 10 years after this date
25% 16 Mar Frost 3 out of 4 years after this date
50% 26 Mar Normal risk Frost every other year after this date
75% 1 Apr Frost 1 out of 4 years after this date
90% 10 Apr 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 Læsø that is 26 Mar. 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 26 Nov in Læsø. At the earliest, frost can arrive around 15 Nov and at the latest around 16 Dec.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 15 Nov Low risk Frost 1 out of 10 years on or before this date
25% 22 Nov Frost 1 out of 4 years on or before this date
50% 26 Nov Normal risk Frost every other year on or before this date
75% 7 Dec Frost 3 out of 4 years on or before this date
90% 16 Dec 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 Læsø that is 26 Nov. 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 26 Feb 16 Oct 232
Persephone period 17 Oct 25 Feb 133
Plan the year's last sowing of cold-hardy plants in Læsø so they are approximately 75% mature by 17 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 26 Feb – 14 Apr 48 Grow long-day plants like spinach, lettuce and coriander.
Longer daylight 14+ h 15 Apr – 28 Aug 136 High risk of bolting
Shorter daylight 10-14 h 29 Aug – 16 Oct 49 Grow long-day plants