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Oskar-Fredriksborg
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Growing Season: Oskar-Fredriksborg

Vaxholm, Stockholm, Sweden
0.2°
Last 24h: Near 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
28 Feb
13 Apr
30 Aug
14 Oct
228 days
Frost-free
10% frost-free
3 May
26 Oct
90% frost risk
176 days
Effective
3 May
14 Oct
164 days

The growing season in Oskar-Fredriksborg is approximately 164 days and is limited by both frost and daylight.

Last spring frost

The last spring frost normally occurs on 3 May in Oskar-Fredriksborg. At the earliest, the last frost is over around 23 Apr and at the latest around 13 May.

Frost-free probabilityFrost-free prob. Date Grower's risk level Explanation
10% 23 Apr High risk Frost 9 out of 10 years after this date
25% 26 Apr Frost 3 out of 4 years after this date
50% 3 May Normal risk Frost every other year after this date
75% 7 May Frost 1 out of 4 years after this date
90% 13 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 Oskar-Fredriksborg that is 3 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 26 Oct in Oskar-Fredriksborg. At the earliest, frost can arrive around 10 Oct and at the latest around 15 Nov.

Frost probabilityFrost prob. Date Grower's risk level Explanation
10% 10 Oct Low risk Frost 1 out of 10 years on or before this date
25% 16 Oct Frost 1 out of 4 years on or before this date
50% 26 Oct Normal risk Frost every other year on or before this date
75% 3 Nov Frost 3 out of 4 years on or before this date
90% 15 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 Oskar-Fredriksborg that is 26 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 28 Feb 14 Oct 228
Persephone period 15 Oct 27 Feb 137
Plan the year's last sowing of cold-hardy plants in Oskar-Fredriksborg so they are approximately 75% mature by 15 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 28 Feb – 12 Apr 44 Grow long-day plants like spinach, lettuce and coriander.
Longer daylight 14+ h 13 Apr – 29 Aug 139 High risk of bolting
Shorter daylight 10-14 h 30 Aug – 14 Oct 46 Grow long-day plants