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Sennes
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Growing Season: Sennes

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
5 Oct
210 days
Frost-free
10% frost-free
6 May
18 Oct
90% frost risk
165 days
Effective
6 May
5 Oct
152 days

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

Last spring frost

The last spring frost normally occurs on 6 May in Sennes. At the earliest, the last frost is over around 30 Apr and at the latest around 23 May.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 30 Apr High risk Frost 9 out of 10 years after this date
25% 1 May Frost 3 out of 4 years after this date
50% 6 May Normal risk Frost every other year after this date
75% 16 May Frost 1 out of 4 years after this date
90% 23 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 Sennes that is 6 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 18 Oct in Sennes. At the earliest, frost can arrive around 3 Oct and at the latest around 3 Nov.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 3 Oct 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% 18 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 Sennes that is 18 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 5 Oct 210
Persephone period 6 Oct 8 Mar 155
Plan the year's last sowing of cold-hardy plants in Sennes so they are approximately 75% mature by 6 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 – 5 Oct 28 Grow long-day plants