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Sjulsmark
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Growing Season: Sjulsmark

Vilhelmina, Västerbotten, Sweden
0.8°
Near frost tomorrow at 22:00. 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
5 Mar
8 Apr
4 Sep
9 Oct
218 days
Frost-free
10% frost-free
3 Jun
29 Aug
90% frost risk
87 days
Effective
3 Jun
29 Aug
87 days

The growing season in Sjulsmark is approximately 87 days and is limited by frost.

Last spring frost

The last spring frost normally occurs on 3 Jun in Sjulsmark. At the earliest, the last frost is over around 21 May and at the latest around 16 Jun.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 21 May High risk Frost 9 out of 10 years after this date
25% 28 May Frost 3 out of 4 years after this date
50% 3 Jun Normal risk Frost every other year after this date
75% 11 Jun Frost 1 out of 4 years after this date
90% 16 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 Sjulsmark that is 3 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 29 Aug in Sjulsmark. At the earliest, frost can arrive around 8 Aug and at the latest around 21 Sep.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 8 Aug Low risk Frost 1 out of 10 years on or before this date
25% 22 Aug Frost 1 out of 4 years on or before this date
50% 29 Aug Normal risk Frost every other year on or before this date
75% 14 Sep Frost 3 out of 4 years on or before this date
90% 21 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 Sjulsmark that is 29 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 5 Mar 9 Oct 218
Persephone period 10 Oct 4 Mar 147
Plan the year's last sowing of cold-hardy plants in Sjulsmark so they are approximately 75% mature by 10 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 5 Mar – 7 Apr 34 Grow long-day plants like spinach, lettuce and coriander.
Longer daylight 14+ h 8 Apr – 3 Sep 149 High risk of bolting
Shorter daylight 10-14 h 4 Sep – 9 Oct 36 Grow long-day plants