Hortuli

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

Log in
Svenska
English
Dansk
Stor-Finnforsen
Create your calendar
Create your calendar

Growing Season: Stor-Finnforsen

Sollefteå, Västernorrland, Sweden

Growing season

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 8 Jun
Daylight
10+ h
14+ h
10+ h
4 Mar
9 Apr
3 Sep
10 Oct
220 days
Frost-free
10% frost-free
20 May
24 Sep
90% frost risk
127 days
Effective
20 May
24 Sep
127 days

The growing season in Stor-Finnforsen is approximately 127 days and is limited by frost.

Last spring frost

The last spring frost normally occurs on 20 May in Stor-Finnforsen. At the earliest, the last frost is over around 7 May and at the latest around 6 Jun.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 7 May High risk Frost 9 out of 10 years after this date
25% 17 May Frost 3 out of 4 years after this date
50% 20 May Normal risk Frost every other year after this date
75% 30 May Frost 1 out of 4 years after this date
90% 6 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 Stor-Finnforsen that is 20 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 24 Sep in Stor-Finnforsen. At the earliest, frost can arrive around 14 Sep and at the latest around 13 Oct.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 14 Sep Low risk Frost 1 out of 10 years on or before this date
25% 20 Sep Frost 1 out of 4 years on or before this date
50% 24 Sep Normal risk Frost every other year on or before this date
75% 2 Oct Frost 3 out of 4 years on or before this date
90% 13 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 Stor-Finnforsen that is 24 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 Stor-Finnforsen 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