The surprise eruption ejected a column of smoke and ash that was dumped as far as 17 kilometers (10.5 miles) from the volcano's foot, Nicaragua journalist Carol Altamirano said.
"Everything is grey, the crops of rice, sesame, vegetable gardens and fruit trees and the cattle pasture is covered in ash," said Altamirano.
The INETER territorial studies institute predicted less intense action in the coming days and no threat to residents.
The massive ash deposit lasted about 30 minutes, and deep rumbling from the volcano alarmed locals. Cars switched on their headlights as everything went dark.
Farmers in the area covered their water sources and moved their animals to safe places, while in the city people used umbrellas, caps and face masks to shield themselves from the ash rain, said the journalist.
The 1,745-meter (5,725 foot) high San Cristobal is one of seven active volcanoes in the Central American country.
It is located in the Chinandega region, 132 kilometers northwest of the capital Managua.
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