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Lockne
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Growing Season: Lockne

Östersund, Jämtland, Sweden
-1.1°
Slight frost tonight at 04:00. Frost temperatures between tomorrow 02:00 – 05:00. Bring in or cover sensitive plants

Growing season

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 30 Apr
Daylight
10+ h
14+ h
10+ h
3 Mar
10 Apr
3 Sep
10 Oct
221 days
Frost-free
10% frost-free
28 May
22 Sep
90% frost risk
117 days
Effective
28 May
22 Sep
117 days

The growing season in Lockne is approximately 117 days and is limited by frost.

Last spring frost

The last spring frost normally occurs on 28 May in Lockne. At the earliest, the last frost is over around 13 May and at the latest around 6 Jun.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 13 May High risk Frost 9 out of 10 years after this date
25% 21 May Frost 3 out of 4 years after this date
50% 28 May Normal risk Frost every other year after this date
75% 3 Jun 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 Lockne that is 28 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 22 Sep in Lockne. At the earliest, frost can arrive around 31 Aug and at the latest around 3 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% 8 Sep Frost 1 out of 4 years on or before this date
50% 22 Sep Normal risk Frost every other year on or before this date
75% 28 Sep Frost 3 out of 4 years on or before this date
90% 3 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 Lockne that is 22 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 10 Oct 221
Persephone period 11 Oct 2 Mar 144
Plan the year's last sowing of cold-hardy plants in Lockne 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 3 Mar – 9 Apr 38 Grow long-day plants like spinach, lettuce and coriander.
Longer daylight 14+ h 10 Apr – 2 Sep 146 High risk of bolting
Shorter daylight 10-14 h 3 Sep – 10 Oct 38 Grow long-day plants