Updated 28 July 2026
Brown birch bolete in County Mayo, 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 44% and looking good in County Mayo
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.
It grows only in association with birch, so look under birch trees in mixed woods, heaths, parkland and damp birch scrub. It favours acidic, moist soils and often appears in mossy or grassy ground near the base of the trees.
The flavour is mild and the flesh turns soft and can go slimy when cooked alone, so it is best used in mixed mushroom dishes rather than as a star. Slice and fry firm young caps with onions for an omelette, add to soups and stews, or dry and grind into a mushroom powder for seasoning.
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.
County Mayo is a wild, windswept corner of Ireland’s Atlantic west, where the drumlin-studded waters of Clew Bay, the cone of Croagh Patrick and the Nephin Beg and Mweelrea mountains give way to vast open blanket bog. Much of the interior is treeless moorland and peatland, broken by the large lakes of Lough Conn and Lough Mask and a deeply indented, exposed coastline. Native woodland is scarce here, surviving mainly as small pockets of oak, birch, hazel and rowan in sheltered valleys and along lake shores, while much of the timber is in Coillte conifer plantations of Sitka spruce. Look for mushrooms at woodland edges, in mossy birch and oak stands, and on the grassy, well-grazed pastures and bog margins that cover so much of the county.
Mayo has a cool, hyper-oceanic climate and is one of the wettest parts of Ireland, with frequent rain, high humidity and strong Atlantic winds throughout the year. Mild winters and damp, cloudy summers keep the ground moist and create excellent conditions for fungi over a long season. Expect a landscape better suited to grassland and bog fungi than to deep woodland species, with waxcaps thriving on the old unimproved pastures and hill grazing for which the west of Ireland is known. The remoteness rewards those willing to walk, but always tread carefully on wet bog and respect that much land is grazed and privately held.
FAQ
What should I look for this week for brown birch bolete in County Mayo, Ireland?
This week in County Mayo, Ireland the forecast is 44% and looking good. 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.
Is it mushroom season in County Mayo, Ireland right now?
For brown birch bolete in County Mayo, Ireland, the typical season is June to October, and today the live forecast reads 44% with conditions looking good this July. 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 brown birch bolete are likely to be fruiting in County Mayo, Ireland. 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 brown birch bolete forecast for County Mayo, Ireland work?
We take the usual brown birch bolete season for County Mayo, Ireland (June to October) and weigh it against the weather right now and over the last few days. That gives you one live number, today 44% and looking good, plus a 14-day outlook and a normal-year line to compare against.
When is brown birch bolete season in County Mayo, Ireland?
In County Mayo, 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 Mayo, Ireland reads 44% and conditions are looking good.
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.