The results of two Ontario byelections this week will offer a key indication about whether or not the province is thrown into a spring election.

Listen to the interview

CBC provincial affairs specialist Robert Fisher looks at what's at take for each party in Thursday's byelections in the ridings of Thornhill and Niagara Falls. Click on the box above to listen to the interview.

Voters head to the polls Thursday in the north Toronto riding of Thornhill and in Niagara Falls.

Click on the image above to watch CBC's provincial affairs reporter Genevieve Tomney set up the two races.

Also, CBC provincial affairs specialist Robert Fischer spoke about the byelections today on CBC Radio's Metro Morning.

Fischer said the Liberals face an uphill battle to get a win in either riding, a scenario he said makes a spring election more likely. Click on the "listen" box in the story sidebar to hear Fisher's interview on Metro Morning.