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Tjautjas
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Growing Season: Tjautjas

Gällivare, Norrbotten, Sweden
-3.2°
Last 24h: Slight frost recorded tonight at 01:00. Inspect for frost damage

Growing season

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 9 May
Daylight
10+ h
14+ h
10+ h
7 Mar
7 Apr
6 Sep
7 Oct
214 days
Frost-free
10% frost-free
7 Jun
26 Aug
90% frost risk
80 days
Effective
7 Jun
26 Aug
80 days

The growing season in Tjautjas is approximately 80 days and is limited by frost.

Last spring frost

The last spring frost normally occurs on 7 Jun in Tjautjas. At the earliest, the last frost is over around 22 May and at the latest around 17 Jun.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 22 May High risk Frost 9 out of 10 years after this date
25% 4 Jun Frost 3 out of 4 years after this date
50% 7 Jun Normal risk Frost every other year after this date
75% 16 Jun Frost 1 out of 4 years after this date
90% 17 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 Tjautjas that is 7 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 26 Aug in Tjautjas. At the earliest, frost can arrive around 8 Aug and at the latest around 13 Sep.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 8 Aug Low risk Frost 1 out of 10 years on or before this date
25% 16 Aug Frost 1 out of 4 years on or before this date
50% 26 Aug Normal risk Frost every other year on or before this date
75% 2 Sep Frost 3 out of 4 years on or before this date
90% 13 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 Tjautjas that is 26 Aug. 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 7 Mar 7 Oct 214
Persephone period 8 Oct 6 Mar 151
Plan the year's last sowing of cold-hardy plants in Tjautjas so they are approximately 75% mature by 8 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 7 Mar – 6 Apr 31 Grow long-day plants like spinach, lettuce and coriander.
Longer daylight 14+ h 7 Apr – 5 Sep 152 High risk of bolting
Shorter daylight 10-14 h 6 Sep – 7 Oct 32 Grow long-day plants