Hortuli

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Blokhus
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Growing Season: Blokhus

North Jutland, Denmark
-0.3°
Last 24h: Slight frost recorded tonight at 05:00. Inspect for frost damage

Growing season

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 7 May
Daylight
10+ h
14+ h
10+ h
26 Feb
15 Apr
29 Aug
16 Oct
232 days
Frost-free
10% frost-free
2 Apr
22 Nov
90% frost risk
234 days
Effective
2 Apr
16 Oct
197 days

The growing season in Blokhus is approximately 197 days and is limited by both frost and daylight.

Last spring frost

The last spring frost normally occurs on 2 Apr in Blokhus. At the earliest, the last frost is over around 12 Mar and at the latest around 14 Apr.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 12 Mar High risk Frost 9 out of 10 years after this date
25% 25 Mar Frost 3 out of 4 years after this date
50% 2 Apr Normal risk Frost every other year after this date
75% 9 Apr Frost 1 out of 4 years after this date
90% 14 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 Blokhus that is 2 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 22 Nov in Blokhus. At the earliest, frost can arrive around 7 Nov and at the latest around 2 Dec.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 7 Nov Low risk Frost 1 out of 10 years on or before this date
25% 18 Nov Frost 1 out of 4 years on or before this date
50% 22 Nov Normal risk Frost every other year on or before this date
75% 26 Nov Frost 3 out of 4 years on or before this date
90% 2 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 Blokhus that is 22 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 Blokhus 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