Create your calendar
-0.6°
Slight frost tonight at 04:00. Frost temperatures between tomorrow 04:00 – 05:00. Bring in or cover sensitive plants
0.0°
Last 24h: Near frost recorded tonight at 05:00. 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
25 Feb
16 Apr
27 Aug
17 Oct
234 days
Frost-free
10% frost-free
5 May
14 Oct
90% frost risk
162 days
Effective
5 May
14 Oct
162 days

The growing season in Hanaskog is approximately 162 days and is limited by frost.

Last spring frost

The last spring frost normally occurs on 5 May in Hanaskog. At the earliest, the last frost is over around 26 Apr and at the latest around 15 May.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 26 Apr High risk Frost 9 out of 10 years after this date
25% 30 Apr Frost 3 out of 4 years after this date
50% 5 May Normal risk Frost every other year after this date
75% 10 May Frost 1 out of 4 years after this date
90% 15 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 Hanaskog that is 5 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 14 Oct in Hanaskog. At the earliest, frost can arrive around 4 Oct and at the latest around 2 Nov.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 4 Oct Low risk Frost 1 out of 10 years on or before this date
25% 9 Oct Frost 1 out of 4 years on or before this date
50% 14 Oct Normal risk Frost every other year on or before this date
75% 27 Oct Frost 3 out of 4 years on or before this date
90% 2 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 Hanaskog that is 14 Oct. 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 25 Feb 17 Oct 234
Persephone period 18 Oct 24 Feb 131
Plan the year's last sowing of cold-hardy plants in Hanaskog so they are approximately 75% mature by 18 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 25 Feb – 15 Apr 50 Grow long-day plants like spinach, lettuce and coriander.
Longer daylight 14+ h 16 Apr – 26 Aug 133 High risk of bolting
Shorter daylight 10-14 h 27 Aug – 17 Oct 52 Grow long-day plants