The ash from Mount Merapi blanketed several villages on the mail island of Java. Its last major eruption in 2010 killed 353 people.
Indonesia's volcano agency warned residents to stay out of a three-kilometre no-go zone around Mount Merapi, citing possible danger from flowing lava and pyroclastic flows.
The airport in Yogyakarta, the nearest big city to the volcano, shut because of the threat from the ash, the state-owned aviation agency AirNav said in a statement.
<p>Indonesia ordered the evacuation of 15,000 residents near an active volcano in the west of the vast archipelago on Sunday as authorities raised the alert for the emergency to the highest level.</p>
The volcano started erupting late last month after years of dormancy.
Indonesia's Mount Merapi threw out massive clouds of smoke on Thursday, sparking panic among villagers living nearby.
Some Indonesian regions near the tumbling volcano are safe now although the alert level is still high.
One blast sends out debris two miles down the slope and hot gases shoot down as volcano erupts in Indonesia.