Eight days on the shores of the Marechal Carmona reservoir. Boom only happens in odd years, and 2027 is the 16th edition — thirty years since it began. It's built around psytrance and electronic music, but attendees consistently describe it as something closer to a transformational arts gathering. Tickets for 2027 are sold out.
Boom Festival happens once every two years, always in odd years, on the shores of an artificial lake — the Marechal Carmona reservoir — near the small town of Idanha-a-Nova in central Portugal. The 2027 edition, running 18–25 July, is the 16th, marking 30 years since the festival began.
The music is psytrance, techno, ambient and experimental electronic — but that undersells what Boom actually is. It runs alongside a serious sustainability programme, large-scale art installations, workshops, healing spaces and a Kosmicare harm-reduction team operating on site throughout. Attendees who come back repeatedly describe it less as a music festival and more as a transformational, community-first gathering that happens to have extraordinary sound systems.
It is genuinely international — people travel from across Europe, the Americas and beyond specifically for this one — and it is not aimed at a casual or mainstream festival crowd. If your reference point is a UK festival field with a bar tent and a headliner, recalibrate before you go.
Boom 2027 sold out after the general online sale opened on 13 October 2026. If you missed out, the face-value prices below are worth knowing, because they tell you whether a resale offer is fair. Boom's pricing is tiered by where you live, not just when you buy.
Friendly Price — a reduced tier available to residents of Portugal, Greece, and countries across Africa and other listed lower-income regions, reflecting real differences in purchasing power. Friendly tickets average €34.38 per day — over the full 8-day festival, that's roughly €275.
Regular Price — for residents of most EU countries plus the UK, US, Australia, Canada, Japan and others. Second-phase Regular tickets average €41.88 per day — around €335 for the full 8 days.
Teen tickets apply to anyone born between 19 July 2009 and 18 July 2012, at the same price as an adult ticket.
How it sold: Ambassador and Friendly Price tickets opened on 6 October 2026, and the general online sale opened on 13 October 2026 at 09:00 Portuguese time, sold in phases until none were left.
If someone offers you a ticket: be careful. Boom's terms say a ticket resold or transferred by anyone other than Boom or its authorised sub-agents is cancelled, and Friendly Price tickets can't be transferred at all. Tickets carry the holder's name and details, so a ticket bought on social media or a resale site could be refused at the gate. If Boom announces any official way to release or swap tickets, it will be on boomfestival.org.
Idanha-a-Nova is not near a major airport. Boomland is roughly 260 km from Lisbon and 360 km from Madrid — this is the single detail that catches out first-timers who assume it's a short transfer from wherever they land.
Charter coaches run direct from the three main airports, with further connections from France, Switzerland and Belgium. Attendees consistently call it the smoothest, easiest option — and report being let onto the site earlier than the general crowd, which matters if you want first pick of a camping spot.
National rail connects Lisbon, Porto and Madrid to Castelo Branco. From there, a shuttle run by the festival covers the final leg to Boomland. Budget travellers also combine FlixBus with local connections — it works, but involves more walking and waiting than the direct Boom Bus.
From Lisbon, metro to Sete Rios, then a public coach to Castelo Branco, then the festival's own shuttle onward. From Madrid, the equivalent route runs from Estación Sur through Lisbon's Sete Rios and onward the same way.
Set your GPS for Alcafozes or Idanha-a-Nova and follow the A23 motorway; festival signage takes over from the town. Useful if you're bringing camping gear or combining Boom with a wider Portugal road trip.
Boom's own materials cover the art, the music and the sustainability programme. What they don't cover is the practical, on-the-ground advice that only comes from people who've actually camped there through a Portuguese July — so here's what attendees consistently say, gathered from festival-goer discussion rather than official sources.
Central Portugal in July is genuinely hot, and attendees are blunt that personal responsibility on heat and water matters more than any other single factor. Drink constantly, stay out of the midday sun, and seek medical help early if you're struggling rather than waiting it out.
Boom runs an on-site drug-checking service, Kosmicare, which attendees value highly but also warn involves long waits, often in direct sun — enough that some people give up before being seen. Go early in the day if you plan to use it, not at peak hours.
Veteran attendees suggest the red or yellow camping zones as the quietest, and stress looking for shade and flat ground before pitching — not just proximity to a stage. Note also: flags are not permitted on site, unlike many European festivals where they're part of the culture.
Source discussion threads for Boom included unverified claims about incidents at a previous edition. We haven't repeated them here — they're serious allegations without evidence behind them, not practical festival information, and not something we're willing to republish without verification.
The biggest swing factors are how you get there and whether you pay Regular or Friendly prices. Here's a realistic range for the full 8 days from the UK (euro costs at roughly 85p to the euro; Boom adds a ticketing fee it doesn't publish in advance).
All-in, most UK attendees are looking at roughly £680–990 plus the ticketing fee for the full 8-day trip. The ticket price depends on whether you qualify for Regular or Friendly pricing.
18–25 July 2027 — eight days — at Boomland near Idanha-a-Nova, Portugal. It's the 16th edition, marking 30 years since the festival began. Boom is biennial and only runs in odd years; after 2027, the next edition is 2029.
Second-phase Regular Price tickets average €41.88/day (~€335 for 8 days); Friendly Price (for Portugal, Greece and other listed regions) averages €34.38/day (~€275 for 8 days). 2027 is now sold out: the general online sale opened on 13 October 2026. Only buy from boomfestival.org, because Boom cancels tickets resold by anyone else.
The official Boom Bus runs direct from Lisbon, Porto and Madrid airports and is the option most attendees recommend. Alternatively, train or public coach to Castelo Branco, then the festival shuttle onward — or drive via the A23, following signage from Idanha-a-Nova.
Psytrance, techno, ambient and experimental electronic music at its core, but attendees describe the whole event as closer to a transformational arts and community gathering — with major art installations, a sustainability programme, workshops and an on-site harm-reduction team (Kosmicare). It's not built for a casual, mainstream festival crowd.
Ticket tiers, travel logistics, or what else is out there if Boom isn't quite your thing — the concierge knows the whole field, not just this one.
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