Updated 11 September 2026
How are Slippery Jack doing in Dalarna this September?
Slippery Jack usually come up in Dalarna from August to November, and right now they’re at 47% and looking good.
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.
It has a distinct membranous ring or partial veil remnant on the stem, an unusual feature among the slippery-capped Suillus boletes.
Always peel off the slimy cap skin and remove the spongy pore layer first, as both can upset the stomach. Slice and fry in butter for a soft side dish, add to risotto or stews where the texture suits, or dry the cleaned pieces and grind into a savoury mushroom powder for stocks and sauces.
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.
Dalarna is a region of rolling forested uplands centred on Lake Siljan and the Dalälven river valleys, rising toward the Scandinavian mountains and open fells in the remote northwest. Lakes, bogs and low hills break up an otherwise heavily wooded interior. The province is dominated by boreal coniferous forest of Scots pine and Norway spruce mixed with birch and aspen. Chanterelles favour mossy spruce and birch ground, while porcini and other boletes thrive on the drier pine heaths and forest edges.
Dalarna has a cold, fairly continental climate with long snowy winters and short warm summers. Reliable late-summer and autumn rainfall keeps the forest floor moist, which suits a long fungal season. This is classic Swedish mushroom country with vast accessible forest under allemansrätten, the right of public access. Expect strong harvests of chanterelles, funnel chanterelles and porcini from late summer into the first frosts of autumn.
FAQ
How does the live slippery jack forecast for Dalarna, Sweden work?
We take the usual slippery jack season for Dalarna, 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 47% and looking good, plus a 14-day outlook and a normal-year line to compare against.
When is slippery jack season in Dalarna, Sweden?
In Dalarna, 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 Dalarna, Sweden reads 47% and conditions are looking good.
Where do slippery jack grow in Dalarna, 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 Dalarna, Sweden so you know when it is worth heading out.
How do I know slippery jack season has started in Dalarna, 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 Dalarna, Sweden it currently sits at 47% and is looking good.
Are slippery jack out near me right now in Dalarna, Sweden?
Today the slippery jack forecast for Dalarna, Sweden is 47% 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 Dalarna, 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.