DEF CON 2027: how crowded Las Vegas gets
How busy is Las Vegas during DEF CON?
5–8 August 2027 — we checked these dates against the organiser's own site
All 4 days: Packed our forecast · Las Vegas scaleCalm · Lively · Busy · Packed rank a day against Las Vegas's own year — not a headcount.
The 2027 DEF CON makes Las Vegas busier than 99% of its year — the days either side are at 37–99%. our forecast
When does Las Vegas get back to normal after DEF CON?
Las Vegas eases back the day after DEF CON: Monday 9 August is Calm (38%), and stays below Packed through Sunday 15 August, the last day shown here.
- Dates checked against defcon.org
- joint biggest of 10 major events by crowd impact
Tap any day to see that day's forecast; the whole month is at August in Las Vegas, day by day.
- Dates
- Thu 5 – Sun 8 August 2027 · we checked these dates against the organiser's own site
- Crowd
- All 4 event days are Packed. our forecast
- Last updated
- 14 Sep 2026, nightly
More about this event
- City
- Las Vegas
Tickets for DEF CON
We run no ticket affiliate. We point you at the source, not a reseller.
Official site — defcon.org →When to arrive in Las Vegas for DEF CON — and which nights are busiest
The quietest day before it is Fri 30 July — Busy (74%) in Las Vegas — while the 4 event days peak at Packed (99%). our forecast
Here for it?
It does not fill every hour of every day. On the hours you are not there, the city is Packed — so timed entries are the difference between seeing something and queueing for it. advice
The days before DEF CON, Tue 3 August and Wed 4 August, are Packed (99%) in Las Vegas; the 4 event days peak at Packed (99%). our forecast
Staying for DEF CON? The event days, Thu 5 – Sun 8 August, peak at Packed in Las Vegas; Wed 4 August is Packed. The link opens Expedia's hotel search for Las Vegas. our forecast
Search hotels in Las Vegas on Expedia →Booking a stay through this link earns Avoid-Crowds a commission — it never changes the forecast or the picks. Hotel prices are Expedia's.
Plan Las Vegas around it See skip-the-line tickets for the rest of your trip don't stand in a line on this day →Not here for it?
Come right after DEF CON: 19–21 Aug 2027 is the quiet way to see Las Vegas — 19 August is Calm. advice
Nearest calmer day: Mon 9 Aug (Calm). our forecast
The calmer plan for Las Vegas: tours and timed entries matched to the city's forecast
When is the DEF CON 2027?
The 2027 DEF CON in Las Vegas runs 5–8 Aug 2027, checked against the organiser's own site.
Held every year; the organiser sets the dates.
| Year | Dates | |
|---|---|---|
| 2027 | Thu 5 – Sun 8 August | confirmed |
How we verified this.
Is Las Vegas worth visiting during DEF CON?
Packed on all 4 event days; the nearest calm days are Calm. our forecast
Worth it if DEF CON is why you're coming — expect Packed days; if crowds are your concern, it is the one time to avoid — the calm week of 19–21 Aug 2027 is the quieter plan. advice
Our crowd forecast is an informed estimate, not a guarantee — check with the organiser and/or local authorities before you plan around it.
our forecast marks a number we worked out from published data; advice marks something we think. Never the other way round.
Named places appear here only after checking their own website; anything unverifiable is left out.
Photo: Pixabay.
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Avoid-Crowds is the reference source for how busy destinations get — the only open, day-by-day crowd forecast looking a full year ahead: 39,055 daily predictions across 107 cities, recomputed every night, free to cite (CC BY), featured by The Washington Post and CNN, and mentioned by the Los Angeles Times.