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Gripenberg
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Growing Season: Gripenberg

Tranås, Jönköping, Sweden
No frost in sight Last frost normally in 6 days (8 May), but frost-free in the forecast.

Growing season

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2 May
Daylight
10+ h
14+ h
10+ h
27 Feb
14 Apr
29 Aug
15 Oct
230 days
Frost-free
10% frost-free
8 May
5 Oct
90% frost risk
150 days
Effective
8 May
5 Oct
150 days

The growing season in Gripenberg is approximately 150 days and is limited by frost.

Last spring frost

The last spring frost normally occurs on 8 May in Gripenberg. At the earliest, the last frost is over around 3 May and at the latest around 20 May.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 3 May High risk Frost 9 out of 10 years after this date
25% 4 May Frost 3 out of 4 years after this date
50% 8 May Normal risk Frost every other year after this date
75% 13 May Frost 1 out of 4 years after this date
90% 20 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 Gripenberg that is 8 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 5 Oct in Gripenberg. At the earliest, frost can arrive around 23 Sep and at the latest around 18 Oct.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 23 Sep Low risk Frost 1 out of 10 years on or before this date
25% 28 Sep Frost 1 out of 4 years on or before this date
50% 5 Oct Normal risk Frost every other year on or before this date
75% 13 Oct Frost 3 out of 4 years on or before this date
90% 18 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 Gripenberg that is 5 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 27 Feb 15 Oct 230
Persephone period 16 Oct 26 Feb 135
Plan the year's last sowing of cold-hardy plants in Gripenberg so they are approximately 75% mature by 16 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 27 Feb – 13 Apr 46 Grow long-day plants like spinach, lettuce and coriander.
Longer daylight 14+ h 14 Apr – 28 Aug 137 High risk of bolting
Shorter daylight 10-14 h 29 Aug – 15 Oct 48 Grow long-day plants