The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás on 30 September 2025 (local). The alert level remained at "Level 2 - Warning" (on a 0â4 level scale). The aviation alert level remained at "Yellow" (level 2 on a 4-level scale).
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás on 29 September 2025 (local). The alert level remained at "Level 2 - Warning" (on a 0â4 level scale). The aviation alert level remained at "Yellow" (level 2 on a 4-level scale).
Sat, 27 Sep 2025, 10:15
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás on 26 September 2025 (local). The alert level remained at "Level 2 - Warning" (on a 0â4 level scale). The aviation alert level remained at "Yellow" (level 2 on a 4-level scale).
Read allThu, 25 Sep 2025, 22:15
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás on 24 September 2025 (local). The alert level remained at "Level 2 - Warning" (on a 0â4 level scale). The aviation alert level remained at "Yellow" (level 2 on a 4-level scale).
Read allWed, 24 Sep 2025, 10:15
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás on 23 September 2025 (local). The alert level remained at "Level 2 - Warning" (on a 0â4 level scale). The aviation alert level remained at "Yellow" (level 2 on a 4-level scale).
Read allFri, 19 Sep 2025, 22:15
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 17 September 2025 (local) and 18 September 2025 (local). Ash, gas, and vapor plume(s) were reported. The alert level remained at "Level 2 - Warning" (on a 0â4 level scale). The aviation alert level remained at "Yellow" (level 2 on a 4-level scale).
Read allThu, 18 Sep 2025, 16:15
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás on 17 September 2025 (local). The alert level remained at "Level 2 - Warning" (on a 0â4 level scale). The aviation alert level remained at "Yellow" (level 2 on a 4-level scale).
Read allWed, 17 Sep 2025, 10:15
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 13 September 2025 (local) and 16 September 2025 (local). Gas and vapor plume(s) were reported. The alert level remained at "Level 2 - Warning" (on a 0â4 level scale). The aviation alert level remained at "Yellow" (level 2 on a 4-level scale).
Read allThu, 11 Sep 2025, 22:15
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 9 September 2025 (local) and 10 September 2025 (local). The alert level remained at "Level 2 - Warning" (on a 0â4 level scale). The aviation alert level remained at "Yellow" (level 2 on a 4-level scale).
Read allWed, 10 Sep 2025, 16:15
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 8 September 2025 (local) and 9 September 2025 (local). The alert level at Poás remained at "Level 2 - Warning" (on a 0–4 level scale). The aviation alert level remained at "Yellow" (level 2 on a 4-level scale).
Read allWed, 10 Sep 2025, 14:00
The Observatorio Vulcanológico y Sismológico de Costa Rica-Universidad Nacional (OVSICORI-UNA) reported continuing gas-and-steam emissions with occasional minor amounts of ash at Poás during 2-9 September. Weather conditions often obscured visual observations of the crater area. Gas emissions at Boca A continued to be hot, approaching 800 degrees Celsius.
Read allTue, 9 Sep 2025, 10:15
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 4 September 2025 (local) and 8 September 2025 (local). The alert level at Poás remained at "Level 2 - Warning" (on a 0–4 level scale). The aviation alert level remained at "Yellow" (level 2 on a 4-level scale). There was 1 explosion reported.
Read allFri, 5 Sep 2025, 08:15
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás on 4 September 2025 (local). The alert level at Poás remained at "Level 2 - Warning" (on a 0–4 level scale). The aviation alert level remained at "Yellow" (level 2 on a 4-level scale). Incandescence was observed at the "Boca A" vent during the night.
Read allThu, 4 Sep 2025, 06:15
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 2 September 2025 (local) and 3 September 2025 (local). The alert level at Poás remained at "Level 2 - Warning" (on a 0–4 level scale). The aviation alert level remained at "Yellow" (level 2 on a 4-level scale). There were 2 seismically detected eruptions reported.
Read allWed, 3 Sep 2025, 18:00
The Observatorio Vulcanológico y Sismológico de Costa Rica-Universidad Nacional (OVSICORI-UNA) reported continuing gas-and-steam emissions with occasional minor amounts of ash at Poás during 27 August-2 September. Variable incandescence at Boca A vent continued to be visible at night. At 1230 on 2 September a gray steam-and-gas plume with a moderate amount of ash rose 500 m above the crater rim and drifted W.
Read allWed, 3 Sep 2025, 05:15
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 1 September 2025 (local) and 2 September 2025 (local). The alert level at Poás remained at "Level 2 - Warning" (on a 0–4 level scale). The aviation alert level remained at "Yellow" (level 2 on a 4-level scale). Incandescence was observed at the "Boca A" vent.
Read allWed, 3 Sep 2025, 02:15
Wed, 27 Aug 2025, 14:00
The Observatorio Vulcanológico y Sismológico de Costa Rica-Universidad Nacional (OVSICORI-UNA) reported continuing gas-and-steam emissions with occasional minor amounts of ash at Poás during 19-26 August. Variable incandescence at Boca A vent continued to be visible at night. The temperature of the gas-and-steam emissions at Boca A were measured with infrared webcam images, by drone, and at varying distances during field visits; the temperatures varied by a few hundred degrees Celusis day-to-day but remained at high levels, as high as 520 degrees during 16-22 August.
Read allWed, 27 Aug 2025, 06:55
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 25 August 2025 (local) and 26 August 2025 (local). The alert level at Poás remained at "Level 2 - Warning" (on a 0–4 level scale). The aviation alert level remained at "Yellow" (level 2 on a 4-level scale).
Read allMon, 25 Aug 2025, 18:55
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 21 August 2025 (local) and 22 August 2025 (local). The alert level at Poás remained at "Level 2 - Warning" (on a 0–4 level scale). Incandescence was observed at the "Boca A" vent during the night.
Read allSun, 24 Aug 2025, 14:55
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 20 August 2025 (local) and 21 August 2025 (local). The alert level at Poás remained at "Level 2 - Warning" (on a 0–4 level scale). Incandescence was observed at the "Boca A" vent during the night.
Read allSat, 23 Aug 2025, 10:55
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 21 August 2025 (local) and 22 August 2025 (local). The alert level at Poás remained at "Level 2 - Warning" (on a 0–4 level scale).
Read allFri, 22 Aug 2025, 06:55
The Observatorio Vulcanológico y Sismológico de Costa Rica - Universidad Nacional (OVSICORI-UNA) reported that the eruption continued at Poás between 20 August 2025 (local) and 21 August 2025 (local). The alert level at Poás remained at "Level 2 - Warning" (on a 0–4 level scale). Incandescence was observed at the "Boca A" vent during the night.
Read allWed, 20 Aug 2025, 14:00
The Observatorio Vulcanológico y Sismológico de Costa Rica-Universidad Nacional (OVSICORI-UNA) reported continuing gas-and-steam emissions with occasional minor amounts of ash at Poás during 12-19 August. Variable incandescence at Boca A vent continued to be visible at night. An ash emission lasting about 12 minutes began at 1710 on 15 August, rose 200 m above the crater rim, and drifted W.
Read allSat, 16 Aug 2025, 01:00
Wed, 13 Aug 2025, 14:00
The Observatorio Vulcanológico y Sismológico de Costa Rica-Universidad Nacional (OVSICORI-UNA) reported continuing gas-and-steam emissions with occasional minor amounts of ash at Poás during 6-12 August. Strong incandescence continued at Boca A vent; temperatures at the vent were estimated to be 800-900 degrees Celsius, based on a photograph taken at 0450 on 6 August. Eruptive events at Boca A recorded at 0451 and 0706 on 7 August generated diffuse ash plumes, each lasting about one minute.
Read allSat, 9 Aug 2025, 07:45
Wed, 6 Aug 2025, 18:00
The Observatorio Vulcanológico y Sismológico de Costa Rica-Universidad Nacional (OVSICORI-UNA) reported continuing gas-and-steam emissions with occasional minor amounts of ash at Poás during 30 July-5 August. Strong incandescence at Boca A vent was observed. Sulfur dioxide emissions remained high and were between 250 and 1,000 tons per day during the week.
Read all
Current status: erupting (4 out of 5)
Poas volcano eruptions:
