Updated 11 September 2026
How are Slippery Jack doing in Gävleborg this September?
Mushroom season in Gävleborg, Sweden is looking good right now, with slippery jack sitting at 51% 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.
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.
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.
Gävleborg stretches from a low, skerry-strewn coast on the Gulf of Bothnia inland to the forested hills and river valleys of Gästrikland and Hälsingland in southern Norrland. The land rises gradually westward, threaded by the Ljusnan and Dalälven rivers and dotted with countless lakes and bogs. This is one of Sweden’s most heavily wooded regions, blanketed in boreal taiga of Norway spruce and Scots pine with birch and aspen mixed in. Mushrooms thrive in the mossy spruce stands, along damp lake and bog margins, and in older mixed forest where the canopy stays cool and shaded.
The climate is humid continental, with cold snowy winters and warm summers that bring frequent rain inland. The reliable late-summer moisture and heavy morning dew make for dependable fungal flushes once the heat eases. Foraging here is generous and uncrowded, helped by Sweden’s right of public access (allemansrätten) that lets you pick freely in the forests. Expect classic Nordic harvests of porcini, chanterelles and other boletes from late summer into autumn, with the inland spruce forests and lake shores being the most productive ground.
FAQ
Are slippery jack out near me right now in Gävleborg, Sweden?
Today the slippery jack forecast for Gävleborg, Sweden is 51% 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 Gävleborg, Sweden right now.
What should I look for this week for slippery jack in Gävleborg, Sweden?
This week in Gävleborg, Sweden the forecast is 51% 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 Gävleborg, Sweden right now?
For slippery jack in Gävleborg, Sweden, the typical season is August to November, and today the live forecast reads 51% 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 Gävleborg, 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 Gävleborg, Sweden work?
We take the usual slippery jack season for Gävleborg, 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 51% and looking good, plus a 14-day outlook and a normal-year line to compare against.
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.