Helicopters and firefighters will again tackle a huge blaze on farmland about 20 kilometres west of Queenstown this morning.

The fire started near Mount Crichton on Friday afternoon, and by yesterday evening it covered about 200 hectares.

Fire and Emergency said a damper evening and cooler conditions had helped.

Six helicopters and seven ground crews are due to return to fight the fire this morning.

Officials said anyone affected by smoke or ash should keep doors and windows closed, and people experiencing health issues should contact Healthline in the first instance.

Fire story yesterday