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Björnrike
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Growing Season: Björnrike

Härjedalen, Jämtland, Sweden
-0.5°
Slight frost tomorrow at 23:00. Frost temperatures between tomorrow 22:00 – 23:00. Bring in or cover sensitive plants

Growing season

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 9 May
Daylight
10+ h
14+ h
10+ h
3 Mar
10 Apr
2 Sep
11 Oct
222 days
Frost-free
10% frost-free
6 Jun
4 Sep
90% frost risk
90 days
Effective
6 Jun
4 Sep
90 days

The growing season in Björnrike is approximately 90 days and is limited by frost.

Last spring frost

The last spring frost normally occurs on 6 Jun in Björnrike. At the earliest, the last frost is over around 24 May and at the latest around 21 Jun.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 24 May High risk Frost 9 out of 10 years after this date
25% 1 Jun Frost 3 out of 4 years after this date
50% 6 Jun Normal risk Frost every other year after this date
75% 17 Jun Frost 1 out of 4 years after this date
90% 21 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 Björnrike that is 6 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 4 Sep in Björnrike. At the earliest, frost can arrive around 13 Jul and at the latest around 23 Sep.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 13 Jul Low risk Frost 1 out of 10 years on or before this date
25% 18 Aug Frost 1 out of 4 years on or before this date
50% 4 Sep Normal risk Frost every other year on or before this date
75% 18 Sep Frost 3 out of 4 years on or before this date
90% 23 Sep 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 Björnrike that is 4 Sep. 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 3 Mar 11 Oct 222
Persephone period 12 Oct 2 Mar 143
Plan the year's last sowing of cold-hardy plants in Björnrike so they are approximately 75% mature by 12 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 3 Mar – 9 Apr 38 Grow long-day plants like spinach, lettuce and coriander.
Longer daylight 14+ h 10 Apr – 1 Sep 145 High risk of bolting
Shorter daylight 10-14 h 2 Sep – 11 Oct 40 Grow long-day plants