Updated 18 September 2026
When will Slippery Jack appear in Östergötland?
Mushroom season in Östergötland, Sweden is looking good right now, with slippery jack sitting at 67% today. The typical season runs August to November, and we’re in September now
It fruits after warm late-summer and autumn rain, typically when day temperatures sit around 10 to 20C and the ground stays damp. A good soaking followed by mild nights usually brings flushes within a week or two.
Late summer through autumn, roughly August to November.
A decent edible with a mild flavour, good in mixed dishes, soups and sauces rather than as the star. Always peel off the slimy cap skin, which can otherwise cause loose stools, and discard the spongy pore layer on older specimens.
Other Suillus boletes such as the larch bolete (Suillus grevillei) and weeping bolete, all of which are also edible, so there are no dangerous poisonous lookalikes. The slimy brown cap, yellow pores and ringed stem set it apart from any toxic gilled mushroom.
Östergötland is split across the middle by the broad, fertile Östgötaslätten plain, with the wooded south Swedish highlands and their many small lakes to the south and the rocky Kolmården ridge to the north. Lake Vättern forms the western edge, while the east breaks up into the islands and skerries of the Baltic archipelago. The richest fungi grow in the highland conifer forests of spruce and pine, in mixed woods on the moraine ridges, and in the unusually old oak and beech stands such as the Tinnerö oak landscape near Linköping and Omberg by Vättern. Calcareous soils on the plain edges and the limestone of Omberg favour a particularly broad range of species.
The climate is mild and humid for the latitude, tempered by Vättern and the Baltic, with most rain falling from late summer into autumn. These warm, wet late-season spells are exactly what trigger the main mushroom flush. A forager here can move between several habitats in a short distance, from chanterelles and porcini in the conifer highlands to grassland and oak-meadow species on the limestone soils. Allemansrätten gives open access, and the patchwork of forest, lake shore and plain edge makes for productive, varied picking from August through October.
FAQ
How does the live slippery jack forecast for Östergötland, Sweden work?
We take the usual slippery jack season for Östergötland, Sweden (August to November) and weigh it against the weather right now and over the last few days. That gives you one live number, today 67% and looking good, plus a 14-day outlook and a normal-year line to compare against.
When is slippery jack season in Östergötland, Sweden?
In Östergötland, Sweden, slippery jack season usually runs August to November. The exact start shifts year to year with rain and temperature, so some years they show up early and some years late. Right now (September) the live forecast for Östergötland, Sweden reads 67% and conditions are looking good.
Where do slippery jack grow in Östergötland, Sweden?
Grows in conifer woods, almost always with pine, on sandy or poor soil and often along forest tracks and clearings. Common in young plantations and appears in groups. They tend to come back to the same kinds of ground year after year, so once you find good cover it is worth checking again. ShroomCast does not share exact spots; it tells you the timing for Östergötland, Sweden so you know when it is worth heading out.
How do I know slippery jack season has started in Östergötland, Sweden?
Season usually kicks off after a warm spell followed by steady rain, with the first flushes appearing somewhere in the August to November window. The clearest sign is the live forecast lifting off zero into ‘just starting’ or ‘building’. For Östergötland, Sweden it currently sits at 67% and is looking good.
Are slippery jack out near me right now in Östergötland, Sweden?
Today the slippery jack forecast for Östergötland, Sweden is 67% and conditions are looking good. That is a live read for the region this September, and it shifts with the weather rather than following a fixed calendar. It tells you if it is worth heading out in Östergötland, Sweden right now.
See the live regional forecast in the ShroomCast app.
This page shows today. The app gives you the full 14-day outlook for your area and all 14 species, so you can pick the right day before you drive out.
Scale: 0-20% very low · 20-40% low · 40-60% moderate · 60-80% high · 80-100% excellent. ShroomCast forecasts fruiting probability from weather, soil, forests and years of observations – a guide, not a guarantee of finds.
ShroomCast forecasts the region and the time of year. It cannot identify mushrooms for you, so confirm any species with a reliable source before eating it.