Updated 11 September 2026
How are Slippery Jack doing in Norrbotten this September?
This week’s slippery jack forecast for Norrbotten, Sweden reads 72% and running strong. The 14-day outlook decides whether to go now or wait, so check https://shroomcast.net/forecast/slippery-jack-forecast-for-norrbotten-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.
Cap is chestnut to dark brown, smooth and very slimy when wet. The underside has fine pale yellow pores rather than gills, and the stem carries a distinct ring with small brown dots above it. The flesh is pale and the smell is mild.
Use fresh within a day or two as the slime makes it perish quickly; peel and clean before chilling. It dries well once peeled and de-pored, and the dried slices or powder keep for months in an airtight jar; it can also be cooked and then frozen.
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.
Sweden’s largest and northernmost county stretches from the low, island-strewn coast of the Gulf of Bothnia, across vast boreal lowlands and the broad valleys of the Lule, Kalix and Torne rivers, up to the bare alpine fells of the Scandes on the Norwegian border. Much of it lies within the Arctic Circle, a sparsely populated land of taiga, bogs and open mountain plateau. Endless taiga of Scots pine and Norway spruce dominates, mixed with birch and aspen, giving way to mountain birch forest as you climb toward the fells. Mushrooms thrive on the mossy, lichen-rich forest floor, in damp spruce stands and among the birches, while the open mires and bog margins hold their own specialities.
A harsh subarctic climate with long, cold winters and short but surprisingly warm summers under the midnight sun. Rainfall is moderate, yet steady late-summer rains and heavy morning dew keep the forest floor reliably moist for fungi. A short, intense season concentrated in August and September, when the boreal forest can yield abundant chanterelles, ceps and other prized boletes across enormous, lightly trodden expanses. Under the right of public access you can roam almost anywhere, but distances are great and you should come prepared for remote, wild terrain.
FAQ
How do I know slippery jack season has started in Norrbotten, 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 Norrbotten, Sweden it currently sits at 72% and is running strong.
Are slippery jack out near me right now in Norrbotten, Sweden?
Today the slippery jack forecast for Norrbotten, Sweden is 72% and conditions are running strong. 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 Norrbotten, Sweden right now.
What should I look for this week for slippery jack in Norrbotten, Sweden?
This week in Norrbotten, Sweden the forecast is 72% and running strong. 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. The 14-day outlook on the page shows whether conditions are climbing toward a flush or easing off, so you can pick your day.
Is it mushroom season in Norrbotten, Sweden right now?
For slippery jack in Norrbotten, Sweden, the typical season is August to November, and today the live forecast reads 72% with conditions running strong 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 Norrbotten, 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.
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.