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Små-Tihällan
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Growing Season: Små-Tihällan

Gävleborg, Sweden

Growing season

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 11 Jun
Daylight
10+ h
14+ h
10+ h
2 Mar
11 Apr
1 Sep
12 Oct
224 days
Frost-free
10% frost-free
26 Apr
7 Nov
90% frost risk
195 days
Effective
26 Apr
12 Oct
169 days

The growing season in Små-Tihällan is approximately 169 days and is limited by both frost and daylight.

Last spring frost

The last spring frost normally occurs on 26 Apr in Små-Tihällan. At the earliest, the last frost is over around 11 Apr and at the latest around 6 May.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 11 Apr High risk Frost 9 out of 10 years after this date
25% 16 Apr Frost 3 out of 4 years after this date
50% 26 Apr Normal risk Frost every other year after this date
75% 1 May Frost 1 out of 4 years after this date
90% 6 May 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 Små-Tihällan that is 26 Apr. 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 7 Nov in Små-Tihällan. At the earliest, frost can arrive around 24 Oct and at the latest around 17 Nov.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 24 Oct Low risk Frost 1 out of 10 years on or before this date
25% 28 Oct Frost 1 out of 4 years on or before this date
50% 7 Nov Normal risk Frost every other year on or before this date
75% 13 Nov Frost 3 out of 4 years on or before this date
90% 17 Nov 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 Små-Tihällan that is 7 Nov. 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 2 Mar 12 Oct 224
Persephone period 13 Oct 1 Mar 141
Plan the year's last sowing of cold-hardy plants in Små-Tihällan so they are approximately 75% mature by 13 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 2 Mar – 10 Apr 40 Grow long-day plants like spinach, lettuce and coriander.
Longer daylight 14+ h 11 Apr – 31 Aug 143 High risk of bolting
Shorter daylight 10-14 h 1 Sep – 12 Oct 42 Grow long-day plants