Hortuli

Search for your location to see a personalised planting calendar, frost dates and more.

Log in
Svenska
English
Dansk
Strömsund
Create your calendar
Create your calendar

Growing Season: Strömsund

Strömsund, Jämtland, Sweden
No frost in sight Last frost normally in 11 days (21 May), but frost-free in the forecast.

Growing season

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

The growing season in Strömsund is approximately 123 days and is limited by frost.

Last spring frost

The last spring frost normally occurs on 21 May in Strömsund. At the earliest, the last frost is over around 11 May and at the latest around 2 Jun.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 11 May High risk Frost 9 out of 10 years after this date
25% 14 May Frost 3 out of 4 years after this date
50% 21 May Normal risk Frost every other year after this date
75% 27 May Frost 1 out of 4 years after this date
90% 2 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 Strömsund that is 21 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 21 Sep in Strömsund. At the earliest, frost can arrive around 31 Aug and at the latest around 4 Oct.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 31 Aug Low risk Frost 1 out of 10 years on or before this date
25% 9 Sep Frost 1 out of 4 years on or before this date
50% 21 Sep Normal risk Frost every other year on or before this date
75% 30 Sep Frost 3 out of 4 years on or before this date
90% 4 Oct 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 Strömsund that is 21 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 4 Mar 10 Oct 220
Persephone period 11 Oct 3 Mar 145
Plan the year's last sowing of cold-hardy plants in Strömsund so they are approximately 75% mature by 11 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 4 Mar – 8 Apr 36 Grow long-day plants like spinach, lettuce and coriander.
Longer daylight 14+ h 9 Apr – 2 Sep 147 High risk of bolting
Shorter daylight 10-14 h 3 Sep – 10 Oct 38 Grow long-day plants