The Tasmania Fire Service held concerns for users of the St Helens Mountain Bike Trails and properties to the north-east of the original fire on Argonaut Road, but no injuries or property damage was reported.

The emergency warning was issued just after midday and downgraded to a watch and act a few hours later.

The fuel reduction burn had been carried out by Sustainable Timber Tasmania on Tuesday.

TFS incident controller Dave Castellar said the fire had been brought under control, and a predicted southerly change with rain could also aid overnight efforts.

He said the emergency warning was a precaution as a result of the unpredictable weather conditions.

"The fire did jump the Golden Fleece Creek area and made a track northeasterly in through some coastal scrub and it was burning into some paddocks in around the north edge of Argonaut Road, but crews have got that under control," Mr Castellar said.

"Initially we put out our emergency alert because with the wind and the fire conditions that were prevalent at the time ... we did put it into an emergency alert in response to information we were getting off the ground from people and fire crews there."

STT and the TFS sent 20 appliances and 60 personnel to the site as part of the firefighting effort - the first emergency fire of the bushfire season.

It caused smoke, ash and ember alerts to be issued to nearby communities of St Helens, Stieglitz and Akaroa. Argonaut Road, Heritage Road and the mountain bike trails were closed.

The size of the fire was yet to be determined, along with the damage caused to the STT timber plantation.

Mr Castellar said all fuel reduction burns have a fire management plan.

"The fire, the fuel reduction burn, was conducted earlier in the week and all fuel reduction burns that are conducted have fire management plans in and around with a containment of any outbreak," he said.

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"It did initiate through the course of later this morning and into the afternoon, they were just very strong winds and had potential there to push ... fire into some unburnt areas.

"The community need to be aware that conditions can dry out very quickly with the rain that we have had through the winter and early spring. But with strong winds such as we had on the east coast today, that fuels can dry out very quickly."

Crews will continue to monitor the fire into Saturday evening.