Updated 11 September 2026
When will Slippery Jack appear in Northumberland?
Mushroom season in Northumberland, England is looking good right now, with slippery jack sitting at 40% 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.
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.
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.
Northumberland is a sparsely populated upland county where the rounded Cheviot Hills rise along the Scottish border and broad sweeps of heather moorland roll east toward the North Sea. Between the hills lie the river valleys of the Tyne, Coquet and Till, while the coast stretches into long sandy beaches, dunes and rocky headlands. Kielder Forest, the largest planted woodland in England, blankets the western moors in dense Sitka spruce, lodgepole pine and larch, classic ground for boletes and milkcaps. Lower down, scattered oak, birch and beech woods along the valleys and the old policy woodlands around country estates offer richer mixed-broadleaf habitat.
The climate is cool and damp, with reliable rainfall over the western uplands where the moors and forests catch the wet westerly weather. The drier eastern coast still sees mild, moist autumns that keep the ground productive well into the season. Expect a tale of two grounds: vast conifer plantations like Kielder for spruce-loving boletes and chanterelles, and the valley broadleaf woods and coastal grasslands for a wider mix. It is remote, uncrowded country, so a forager has space to roam but should plan for changeable upland weather.
FAQ
Is it mushroom season in Northumberland, England right now?
For slippery jack in Northumberland, England, the typical season is August to November, and today the live forecast reads 40% 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 Northumberland, England. 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 Northumberland, England work?
We take the usual slippery jack season for Northumberland, England (August to November) and weigh it against the weather right now and over the last few days. That gives you one live number, today 40% and looking good, plus a 14-day outlook and a normal-year line to compare against.
When is slippery jack season in Northumberland, England?
In Northumberland, England, 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 Northumberland, England reads 40% and conditions are looking good.
Where do slippery jack grow in Northumberland, England?
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 Northumberland, England 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.