Updated 28 July 2026
Brown birch bolete in County Donegal, Ireland: live forecast and 14-day outlook
The best time for brown birch bolete in Ireland is June to October, with the peak normally in the middle of that range. Today they’re at 21% and building in County Donegal
It fruits after warm summer or autumn rain, typically when daytime temperatures sit around 12 to 20 C and the ground stays damp. A good soaking followed by mild, humid days a week or so later usually brings them up.
Greyish to dull brown cap up to about 15 cm, with a spongy pore surface underneath that is whitish then greying (not gills). The tall stem is whitish and covered in small dark brown to blackish scales, and the white flesh is soft, barely changing colour when cut.
Use fresh within a day or two as it deteriorates fast and the flesh softens quickly. It dries well into slices or powder, and you can also slice and freeze it after a brief sauté to hold its texture better.
Easily told from other Leccinum such as the orange birch bolete by its dull brown cap. It has no deadly lookalikes, but as a bolete only ever pick firm specimens, since old soft ones cause stomach upsets, and avoid any bolete with red or orange pores and blue-staining flesh.
Donegal is the most mountainous county in Ulster, dominated by the quartzite cone of Errigal and the Derryveagh and Blue Stack ranges, with vast blanket bog spread across the uplands. Its deeply indented Atlantic coastline of cliffs, headlands and sandy bays gives way inland to glacial valleys, loughs and rough grazing. Pockets of native oak, birch, hazel and holly survive in places like Glenveagh and the Celtic rainforest of Ardnamona, where mossy ground and damp glens favour fungi. Most woodland, however, is Coillte conifer plantation, chiefly Sitka spruce on upland peat, whose mossy edges and rides are productive ground.
The climate is cool and distinctly wet, shaped by the North Atlantic Drift and prevailing Atlantic westerlies that drive rain in off the ocean year-round. Annual rainfall runs from about 1,000mm on the coast to over 1,500mm in the hills, keeping the ground reliably moist for fungi. Expect a damp, oceanic foraging ground where boggy moor, spruce plantation and the rare native wood each hold their own species, but searching means covering open, exposed terrain. The long, mild autumn extends the season, though weather off the Atlantic can turn quickly.
FAQ
When is brown birch bolete season in County Donegal, Ireland?
In County Donegal, Ireland, brown birch bolete season usually runs June to October. The exact start shifts year to year with rain and temperature, so some years they show up early and some years late. Right now (July) the live forecast for County Donegal, Ireland reads 21% and conditions are building.
Where do brown birch bolete grow in County Donegal, Ireland?
Grows in mycorrhizal association with birch only, so look for it under birch trees on heaths, in mixed woodland, parks and on grassy verges. It often appears in damp, mossy ground. 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 County Donegal, Ireland so you know when it is worth heading out.
How do I know brown birch bolete season has started in County Donegal, Ireland?
Season usually kicks off after a warm spell followed by steady rain, with the first flushes appearing somewhere in the June to October window. The clearest sign is the live forecast lifting off zero into ‘just starting’ or ‘building’. For County Donegal, Ireland it currently sits at 21% and is building.
Are brown birch bolete out near me right now in County Donegal, Ireland?
Today the brown birch bolete forecast for County Donegal, Ireland is 21% and conditions are building. That is a live read for the region this July, and it shifts with the weather rather than following a fixed calendar. It tells you if it is worth heading out in County Donegal, Ireland right now.
What should I look for this week for brown birch bolete in County Donegal, Ireland?
This week in County Donegal, Ireland the forecast is 21% and building. Grows in mycorrhizal association with birch only, so look for it under birch trees on heaths, in mixed woodland, parks and on grassy verges. It often appears in damp, mossy ground. 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.
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.