Gianforte will assume office later this month.
Gianforte pleaded guilty to charges that he assaulted Guardian reporter Ben Jacobs at the politician's campaign headquarters on May 24 - an incident that was witnessed by other journalists and captured on audiotape.
In the audio, Jacobs is heard asking Gianforte a question about health care.
He was ordered to pay a $385 fine, do 40 hours community service, and enroll in 20 hours of anger management counseling. Gianforte also wrote a letter of apology to Jacobs and admitted that his actions were "unlawful".
Gianforte is expected to be sworn in as Montana's lone representative in the U.S. House later this month.
Gianforte put out a statement that said he takes full responsibility for his actions and that he and Jacobs "are both ready to move on".
Legal experts say the sentence Gianforte received is not out of the ordinary for someone guilty of misdemeanor assault with a previously clean record. Jacobs tweeted the accusation that night.
Gianforte apologized on the night of his election victory as well. Ben Jacobs. He has accepted my apology.
"I look forward to putting this behind me. I'm excited to get to work".
West initially tried to give Gianforte a sentence of four days in jail, converted to two days in a work program.
One woman said, " That certainly isn't up to me, but I don't know it's too confusing to even know.
"I am confident that he will be a strong advocate for a free press and the First Amendment", Jacobs said in court Monday. I'm reaching out to associations across the state and starting to make plans in the next couple days. "I acted in a way that isn't consistent with my behavior in the past".
"You just body slammed me and broke my glasses", Jacobs replies. "Get the hell out of here ... get the hell out of here!" He will not serve any time in jail. His glasses were donated to the Newseum, a museum in Washington, D.C., dedicated to journalism, at the request of the museum. Montanans said Bernie Sanders and Nancy Pelosi can't call the shots in Montana.
Last week, Gianforte, 56, settled civil claims with Jacobs, paying him $4,464.97 in restitution.
Still, despite his crimes, he won the Congressional seat and ignored pressure to turn the job down. Zinke resigned to become Interior Department secretary.
"Greg Gianforte is an embarrassment to Montana".