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Stor-Hullsjöviken
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Growing Season: Stor-Hullsjöviken

Sundsvall, Västernorrland, Sweden

Growing season

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

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

Last spring frost

The last spring frost normally occurs on 21 May in Stor-Hullsjöviken. 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% 13 May Frost 3 out of 4 years after this date
50% 21 May Normal risk Frost every other year after this date
75% 29 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 Stor-Hullsjöviken 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 25 Sep in Stor-Hullsjöviken. At the earliest, frost can arrive around 12 Sep and at the latest around 10 Oct.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 12 Sep Low risk Frost 1 out of 10 years on or before this date
25% 21 Sep Frost 1 out of 4 years on or before this date
50% 25 Sep Normal risk Frost every other year on or before this date
75% 4 Oct Frost 3 out of 4 years on or before this date
90% 10 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-Hullsjöviken that is 25 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 Stor-Hullsjöviken 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