Safety
Volcanic Alert Levels and When the Climb Closes
Villarrica's alert has swung from green to orange in a single season. What each level means for access — checked 23 Aug 2026.
Check dates and availability ↗SERNAGEOMIN volcanic technical alert levels and their practical effect on Villarrica access
| Alert level | What SERNAGEOMIN means by it | Typical effect on the summit climb |
|---|---|---|
| Verde (Green) | Activity normal within the instrumental monitoring record | Ascents normally permitted, subject to weather and CONAF |
| Amarilla (Yellow) | Monitoring parameters rising — minor explosions, seismic swarms | Crater exclusion perimeter widened; summit access commonly suspended |
| Naranja (Orange) | Significant upward change; markedly raised eruption probability | Park and ski centre closed; the Sept 2023 orange carried an 8 km perimeter |
| Roja (Red) | An eruption is imminent or under way | Park closed; evacuations |
| Status when written | Verde (Green), with elevated in-crater activity | Checked 23 August 2026 — always re-verify before booking |
Who decides what, and who closes what
Three Chilean agencies matter and they do different jobs. SERNAGEOMIN, through its southern Andes observatory OVDAS, monitors the volcano and sets the four-level alerta técnica. SENAPRED translates that into civil-protection alerts for the surrounding communes and defines exclusion perimeters. CONAF administers the national park and decides whether the gate and route are open. A green technical alert therefore does not automatically mean an open mountain, and a closure notice can come from any of the three.
The four levels, and what they mean for you
Green means the volcano is behaving within its own long monitoring baseline. Because Villarrica is permanently active, green routinely includes visible gas, night-time glow and small explosions confined to the crater. Yellow signals measurable escalation and typically brings a widened exclusion radius, usually enough to stop summit ascents. Orange means a significant upward shift and has historically closed the park outright. Red means an eruption is imminent or in progress.
What green looked like in August 2026
As of 23 August 2026, when this guide was written, SERNAGEOMIN held Villarrica at green — but at the active end of it. OVDAS reported intermittent incandescence from 16 August becoming persistent by the early hours of 18 August, with an estimated column height around 40 metres and a satellite thermal anomaly of 1.86 megawatts. The agency described this as a change in surface behaviour not seen since early June 2026, and explicitly did not rule out further episodes. This is exactly why you check the date on any alert claim.
September 2023: what an orange alert does to a season
In late September 2023 SERNAGEOMIN raised Villarrica to orange after a gradual increase in activity. The consequences were immediate and regional: an eight-kilometre exclusion perimeter, the evacuation of around 30 families, suspended classes in Pucón, and the closure of both the national park and the ski centre. The alert stepped back down to yellow in October 2023, and by January 2024 the safety perimeter had been reduced to one kilometre from the active crater.
March 2015: the reminder underneath all of this
At around 03:00 on 3 March 2015, Villarrica's persistent strombolian activity intensified into a continuous eruption that threw a lava fountain roughly 1.5 kilometres above the crater and sent lava down the flanks. Authorities issued a red alert and evacuated in the region of 3,400 people from a ten-kilometre radius overnight. No injuries were reported and most residents returned the same day, but the event is the clearest illustration of why the monitoring, perimeters and closures exist.
How to check before you go — and again before you climb
Check twice: once before you commit money and travel dates, and again the evening before your climb. The authoritative sources are SERNAGEOMIN and its RNVV volcano-monitoring pages for the technical alert, and SENAPRED for the civil-protection alert and any exclusion perimeter; CONAF and pasesparques.cl carry park closures. Build the possibility of closure into your plans rather than your hopes: a reputable operator will reschedule a climb the authorities have cancelled, but nobody can reschedule your flight home.