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Bjornoya
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Growing Season: Bjornoya

Norway

Growing season

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 8 Jun
Daylight
10+ h
14+ h
10+ h
12 Mar
1 Apr
11 Sep
1 Oct
203 days
Frost-free
10% frost-free
30 Jun
16 Aug
90% frost risk
47 days
Effective
30 Jun
16 Aug
47 days

The growing season in Bjornoya is approximately 47 days and is limited by frost.

Last spring frost

The last spring frost normally occurs on 30 Jun in Bjornoya. At the earliest, the last frost is over around 14 Jun and at the latest around 30 Jun.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 14 Jun High risk Frost 9 out of 10 years after this date
25% 18 Jun Frost 3 out of 4 years after this date
50% 30 Jun Normal risk Frost every other year after this date
75% 30 Jun Frost 1 out of 4 years after this date
90% 30 Jun 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 Bjornoya that is 30 Jun. 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 16 Aug in Bjornoya. At the earliest, frost can arrive around 1 Jul and at the latest around 25 Nov.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 1 Jul Low risk Frost 1 out of 10 years on or before this date
25% 1 Jul Frost 1 out of 4 years on or before this date
50% 16 Aug Normal risk Frost every other year on or before this date
75% 15 Oct Frost 3 out of 4 years on or before this date
90% 25 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 Bjornoya that is 16 Aug. 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 12 Mar 1 Oct 203
Persephone period 2 Oct 11 Mar 162
Plan the year's last sowing of cold-hardy plants in Bjornoya so they are approximately 75% mature by 2 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 12 Mar – 31 Mar 20 Grow long-day plants like spinach, lettuce and coriander.
Longer daylight 14+ h 1 Apr – 10 Sep 163 High risk of bolting
Shorter daylight 10-14 h 11 Sep – 1 Oct 21 Grow long-day plants