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Storholmen
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Growing Season: Storholmen

Hasvik, Finnmark, Norway

Growing season

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 28 Jun
Daylight
10+ h
14+ h
10+ h
9 Mar
4 Apr
8 Sep
4 Oct
209 days
Frost-free
10% frost-free
5 May
19 Oct
90% frost risk
167 days
Effective
5 May
4 Oct
152 days

The growing season in Storholmen is approximately 152 days and is limited by both frost and daylight.

Last spring frost

The last spring frost normally occurs on 5 May in Storholmen. At the earliest, the last frost is over around 27 Apr and at the latest around 22 May.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 27 Apr High risk Frost 9 out of 10 years after this date
25% 30 Apr Frost 3 out of 4 years after this date
50% 5 May Normal risk Frost every other year after this date
75% 17 May Frost 1 out of 4 years after this date
90% 22 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 Storholmen that is 5 May. 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 19 Oct in Storholmen. At the earliest, frost can arrive around 26 Sep and at the latest around 3 Nov.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 26 Sep Low risk Frost 1 out of 10 years on or before this date
25% 9 Oct Frost 1 out of 4 years on or before this date
50% 19 Oct Normal risk Frost every other year on or before this date
75% 26 Oct Frost 3 out of 4 years on or before this date
90% 3 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 Storholmen that is 19 Oct. 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 9 Mar 4 Oct 209
Persephone period 5 Oct 8 Mar 156
Plan the year's last sowing of cold-hardy plants in Storholmen so they are approximately 75% mature by 5 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 9 Mar – 3 Apr 26 Grow long-day plants like spinach, lettuce and coriander.
Longer daylight 14+ h 4 Apr – 7 Sep 157 High risk of bolting
Shorter daylight 10-14 h 8 Sep – 4 Oct 27 Grow long-day plants