The Republican governor and Lt. Gov. Karyn Polito will launch their re-election bid on Saturday at their annual summer picnic in Shrewsbury.
Baker announced in November that he would seek another term. He previously said he wanted to wait until the legislative session was over before turning to campaigning.
Baker is being challenged in the Sept. 4 primary by Scott Lively, a staunchly conservative Springfield pastor.
Jay Gonzalez and Robert Massie are seeking the Democratic nomination for governor.
After the summer picnic, Baker and Polito will go to the Gloucester Blues Festival and Gloucester Main Street Block Party.
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