Updated 23 September 2026
When is the best time to find Slippery Jack in Østfold?
The best time for slippery jack in Norway is August to November, with the peak normally in the middle of that range. Today they’re at 56% and looking good in Østfold
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.
Late summer through autumn, roughly August to November.
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.
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.
FAQ
When is slippery jack season in Østfold, Norway?
In Østfold, Norway, 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 Østfold, Norway reads 56% and conditions are looking good.
Where do slippery jack grow in Østfold, Norway?
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 Østfold, Norway so you know when it is worth heading out.
How do I know slippery jack season has started in Østfold, Norway?
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 Østfold, Norway it currently sits at 56% and is looking good.
Are slippery jack out near me right now in Østfold, Norway?
Today the slippery jack forecast for Østfold, Norway is 56% 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 Østfold, Norway right now.
What should I look for this week for slippery jack in Østfold, Norway?
This week in Østfold, Norway the forecast is 56% 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.
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.