Hortuli

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Frigg
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Growing Season: Frigg

Norway

Growing season

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 9 Jun
Daylight
10+ h
14+ h
10+ h
28 Feb
13 Apr
31 Aug
13 Oct
227 days
Frost-free
10% frost-free
23 Feb
5 Dec
90% frost risk
285 days
Effective
28 Feb
13 Oct
227 days

The growing season in Frigg is approximately 227 days and is limited by daylight.

Last spring frost

The last spring frost normally occurs on 23 Feb in Frigg. At the earliest, the last frost is over around 14 Jan and at the latest around 2 Apr.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 14 Jan High risk Frost 9 out of 10 years after this date
25% 20 Jan Frost 3 out of 4 years after this date
50% 23 Feb Normal risk Frost every other year after this date
75% 23 Mar Frost 1 out of 4 years after this date
90% 2 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 Frigg that is 23 Feb. 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 5 Dec in Frigg. At the earliest, frost can arrive around 24 Nov and at the latest around 11 Dec.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 24 Nov Low risk Frost 1 out of 10 years on or before this date
25% 27 Nov Frost 1 out of 4 years on or before this date
50% 5 Dec Normal risk Frost every other year on or before this date
75% 6 Dec Frost 3 out of 4 years on or before this date
90% 11 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 Frigg that is 5 Dec. 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 28 Feb 13 Oct 227
Persephone period 14 Oct 27 Feb 138
Plan the year's last sowing of cold-hardy plants in Frigg so they are approximately 75% mature by 14 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 28 Feb – 12 Apr 44 Grow long-day plants like spinach, lettuce and coriander.
Longer daylight 14+ h 13 Apr – 30 Aug 140 High risk of bolting
Shorter daylight 10-14 h 31 Aug – 13 Oct 44 Grow long-day plants