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Lillhärdal
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Growing Season: Lillhärdal

Härjedalen, Jämtland, Sweden
-0.5°
Slight frost tomorrow at 23:00. 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
2 Mar
11 Apr
2 Sep
11 Oct
223 days
Frost-free
10% frost-free
3 Jun
4 Sep
90% frost risk
93 days
Effective
3 Jun
4 Sep
93 days

The growing season in Lillhärdal is approximately 93 days and is limited by frost.

Last spring frost

The last spring frost normally occurs on 3 Jun in Lillhärdal. At the earliest, the last frost is over around 8 May and at the latest around 22 Jun.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 8 May High risk Frost 9 out of 10 years after this date
25% 20 May Frost 3 out of 4 years after this date
50% 3 Jun Normal risk Frost every other year after this date
75% 13 Jun Frost 1 out of 4 years after this date
90% 22 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 Lillhärdal 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 4 Sep in Lillhärdal. At the earliest, frost can arrive around 21 Aug and at the latest around 24 Sep.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 21 Aug Low risk Frost 1 out of 10 years on or before this date
25% 26 Aug Frost 1 out of 4 years on or before this date
50% 4 Sep Normal risk Frost every other year on or before this date
75% 17 Sep Frost 3 out of 4 years on or before this date
90% 24 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 Lillhärdal that is 4 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 2 Mar 11 Oct 223
Persephone period 12 Oct 1 Mar 142
Plan the year's last sowing of cold-hardy plants in Lillhärdal 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 2 Mar – 10 Apr 40 Grow long-day plants like spinach, lettuce and coriander.
Longer daylight 14+ h 11 Apr – 1 Sep 144 High risk of bolting
Shorter daylight 10-14 h 2 Sep – 11 Oct 40 Grow long-day plants