Hortuli

Search for your location to see a personalised planting calendar, frost dates and more.

Log in
Svenska
English
Dansk
Kiruna
Create your calendar
Create your calendar

Growing Season: Kiruna

Kiruna, Norrbotten, Sweden
0.6°
Near frost tonight at 01:00. Bring in or cover sensitive plants
-1.0°
Last 24h: Slight frost recorded last night at 05:00. Inspect for frost damage

Growing season

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

The growing season in Kiruna is approximately 98 days and is limited by frost.

Last spring frost

The last spring frost normally occurs on 1 Jun in Kiruna. At the earliest, the last frost is over around 21 May and at the latest around 13 Jun.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 21 May High risk Frost 9 out of 10 years after this date
25% 23 May Frost 3 out of 4 years after this date
50% 1 Jun Normal risk Frost every other year after this date
75% 7 Jun Frost 1 out of 4 years after this date
90% 13 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 Kiruna that is 1 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 7 Sep in Kiruna. At the earliest, frost can arrive around 17 Aug and at the latest around 19 Sep.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 17 Aug Low risk Frost 1 out of 10 years on or before this date
25% 23 Aug Frost 1 out of 4 years on or before this date
50% 7 Sep Normal risk Frost every other year on or before this date
75% 14 Sep Frost 3 out of 4 years on or before this date
90% 19 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 Kiruna that is 7 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 7 Mar 6 Oct 213
Persephone period 7 Oct 6 Mar 152
Plan the year's last sowing of cold-hardy plants in Kiruna so they are approximately 75% mature by 7 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 – 5 Apr 30 Grow long-day plants like spinach, lettuce and coriander.
Longer daylight 14+ h 6 Apr – 5 Sep 153 High risk of bolting
Shorter daylight 10-14 h 6 Sep – 6 Oct 31 Grow long-day plants