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Have-Borup
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Growing Season: Have-Borup

Zealand, Denmark

Growing season

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 8 Jun
Daylight
10+ h
14+ h
10+ h
24 Feb
17 Apr
27 Aug
17 Oct
235 days
Frost-free
10% frost-free
27 Apr
1 Nov
90% frost risk
188 days
Effective
27 Apr
17 Oct
173 days

The growing season in Have-Borup is approximately 173 days and is limited by both frost and daylight.

Last spring frost

The last spring frost normally occurs on 27 Apr in Have-Borup. At the earliest, the last frost is over around 14 Apr and at the latest around 4 May.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 14 Apr High risk Frost 9 out of 10 years after this date
25% 20 Apr Frost 3 out of 4 years after this date
50% 27 Apr Normal risk Frost every other year after this date
75% 3 May Frost 1 out of 4 years after this date
90% 4 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 Have-Borup that is 27 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 1 Nov in Have-Borup. At the earliest, frost can arrive around 14 Oct and at the latest around 23 Nov.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 14 Oct Low risk Frost 1 out of 10 years on or before this date
25% 18 Oct Frost 1 out of 4 years on or before this date
50% 1 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% 23 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 Have-Borup that is 1 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 17 Oct 235
Persephone period 18 Oct 23 Feb 130
Plan the year's last sowing of cold-hardy plants in Have-Borup so they are approximately 75% mature by 18 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 – 26 Aug 132 High risk of bolting
Shorter daylight 10-14 h 27 Aug – 17 Oct 52 Grow long-day plants