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Blegholm
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Growing Season: Blegholm

South Denmark, Denmark

Growing season

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 5 Jun
Daylight
10+ h
14+ h
10+ h
23 Feb
17 Apr
26 Aug
18 Oct
237 days
Frost-free
10% frost-free
27 Mar
25 Nov
90% frost risk
243 days
Effective
27 Mar
18 Oct
205 days

The growing season in Blegholm is approximately 205 days and is limited by both frost and daylight.

Last spring frost

The last spring frost normally occurs on 27 Mar in Blegholm. At the earliest, the last frost is over around 22 Feb and at the latest around 12 Apr.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 22 Feb High risk Frost 9 out of 10 years after this date
25% 18 Mar Frost 3 out of 4 years after this date
50% 27 Mar Normal risk Frost every other year after this date
75% 4 Apr Frost 1 out of 4 years after this date
90% 12 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 Blegholm that is 27 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 25 Nov in Blegholm. At the earliest, frost can arrive around 8 Nov and at the latest around 12 Dec.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 8 Nov Low risk Frost 1 out of 10 years on or before this date
25% 19 Nov Frost 1 out of 4 years on or before this date
50% 25 Nov Normal risk Frost every other year on or before this date
75% 2 Dec Frost 3 out of 4 years on or before this date
90% 12 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 Blegholm that is 25 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 23 Feb 18 Oct 237
Persephone period 19 Oct 22 Feb 128
Plan the year's last sowing of cold-hardy plants in Blegholm so they are approximately 75% mature by 19 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 23 Feb – 16 Apr 53 Grow long-day plants like spinach, lettuce and coriander.
Longer daylight 14+ h 17 Apr – 25 Aug 131 High risk of bolting
Shorter daylight 10-14 h 26 Aug – 18 Oct 54 Grow long-day plants