Updated 11 September 2026
When will Slippery Jack appear in Västerbotten?
This week’s slippery jack forecast for Västerbotten, Sweden reads 53% and looking good. The 14-day outlook decides whether to go now or wait, so check https://shroomcast.net/forecast/slippery-jack-forecast-for-vasterbotten-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.
In the same pine woods and season look for other Suillus such as larch bolete and weeping bolete, plus saffron milkcaps and the occasional bay bolete or porcini on richer patches. False chanterelles and various brittlegills often share the same acidic ground.
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.
Västerbotten stretches from the Gulf of Bothnia coast in the east, across broad forested uplands and the Ume and Skellefte river valleys, up to the eastern edge of the Scandinavian Mountains in the west. The terrain is a low-relief mosaic of rolling hills, lakes, rivers and extensive peatland mires, rising gradually toward the fells. The region is overwhelmingly taiga: dense boreal forest of Scots pine and Norway spruce, mixed with birch on damper and more open ground. Mushrooms favour the spruce woods and mossy mixed stands, the birch margins, and the edges of mires and forest tracks.
This is a cold subarctic, continental climate with long snowy winters and short, fairly cool summers. Most rain falls in late summer, and that combination of late-summer showers and lingering moisture in the moss is what triggers the main fungal flush. Foraging here means quiet, sparsely populated forest with little pressure and the freedom of allemansrätten. Expect chanterelles, porcini, birch boletes and russulas from roughly August into September, often overlapping with the cloudberry harvest on the mires.
FAQ
What should I look for this week for slippery jack in Västerbotten, Sweden?
This week in Västerbotten, Sweden the forecast is 53% and looking good. 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 Västerbotten, Sweden right now?
For slippery jack in Västerbotten, Sweden, the typical season is August to November, and today the live forecast reads 53% with conditions looking good 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 Västerbotten, 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 Västerbotten, Sweden work?
We take the usual slippery jack season for Västerbotten, 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 53% and looking good, plus a 14-day outlook and a normal-year line to compare against.
When is slippery jack season in Västerbotten, Sweden?
In Västerbotten, 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 Västerbotten, Sweden reads 53% and conditions are looking good.
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.