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Husum-Ballum
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Growing Season: Husum-Ballum

South Denmark, Denmark

Growing season

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 7 Jun
Daylight
10+ h
14+ h
10+ h
24 Feb
17 Apr
26 Aug
18 Oct
236 days
Frost-free
10% frost-free
9 Apr
4 Nov
90% frost risk
209 days
Effective
9 Apr
18 Oct
192 days

The growing season in Husum-Ballum is approximately 192 days and is limited by both frost and daylight.

Last spring frost

The last spring frost normally occurs on 9 Apr in Husum-Ballum. At the earliest, the last frost is over around 25 Mar and at the latest around 2 May.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 25 Mar High risk Frost 9 out of 10 years after this date
25% 1 Apr Frost 3 out of 4 years after this date
50% 9 Apr Normal risk Frost every other year after this date
75% 25 Apr Frost 1 out of 4 years after this date
90% 2 May 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 Husum-Ballum that is 9 Apr. 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 4 Nov in Husum-Ballum. At the earliest, frost can arrive around 17 Oct and at the latest around 28 Nov.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 17 Oct Low risk Frost 1 out of 10 years on or before this date
25% 27 Oct Frost 1 out of 4 years on or before this date
50% 4 Nov Normal risk Frost every other year on or before this date
75% 20 Nov Frost 3 out of 4 years on or before this date
90% 28 Nov 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 Husum-Ballum that is 4 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 24 Feb 18 Oct 236
Persephone period 19 Oct 23 Feb 129
Plan the year's last sowing of cold-hardy plants in Husum-Ballum 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 24 Feb – 16 Apr 52 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