Updated 11 September 2026
Is it Slippery Jack season in Jämtland right now?
This week’s slippery jack forecast for Jämtland, Sweden reads 39% and building. The 14-day outlook decides whether to go now or wait, so check https://shroomcast.net/forecast/slippery-jack-forecast-for-jamtland-sweden/ before you set out
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.
Strictly associated with pines, so look in conifer plantations and natural pine woods, often on sandy or poor acidic soil. It favours forest edges, paths, grassy verges and young plantations rather than deep shade.
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.
Jämtland is an inland province built around the great lake Storsjön, where rolling forested hills and river valleys rise westward into the bare alpine fells along the Norwegian border. Between the woods lie open bogs, mires and grazing pastures, with no coastline anywhere in the region. The land is dominated by boreal taiga of Norway spruce and Scots pine, mixed with birch and the mountain birch belt at higher elevations. Spruce stands, mossy pine heaths and damp birch woodland are the prime ground for chanterelles, boletes and other porcini-family mushrooms.
The climate is continental and subarctic, with long cold winters, short cool summers and a brief growing season. Rainfall comes mainly in late summer, and the moist, cool autumn nights suit fungi well even if the season is short. Foraging here means vast, lightly populated forest with generous space and the right to roam, though the harvest window is narrow and weather-dependent. Expect chanterelles and boletes in good years, with the best picking from August into a frost-shortened September.
FAQ
Is it mushroom season in Jämtland, Sweden right now?
For slippery jack in Jämtland, Sweden, the typical season is August to November, and today the live forecast reads 39% with conditions building this September. So yes or no depends on the day and the weather, which is exactly what the forecast tracks.
Does ShroomCast tell me if a mushroom is safe to eat or identify it for me?
No. ShroomCast only forecasts timing, so it tells you when slippery jack are likely to be fruiting in Jämtland, Sweden. It does not identify mushrooms, and it cannot tell you whether anything you pick is safe to eat. Always confirm your own identification from a reliable source before eating anything.
How does the live slippery jack forecast for Jämtland, Sweden work?
We take the usual slippery jack season for Jämtland, 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 39% and building, plus a 14-day outlook and a normal-year line to compare against.
When is slippery jack season in Jämtland, Sweden?
In Jämtland, 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 Jämtland, Sweden reads 39% and conditions are building.
Where do slippery jack grow in Jämtland, 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 Jämtland, Sweden so you know when it is worth heading out.
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.