Local Democrats said they were forced to pull the plug on a gathering scheduled to take place in Pflugerville – a small city about 17 miles north of Austin – due to "security reasons".
It came as vice-presidential candidate, senator Kamala Harris, completed a whistle-stop three-city tour of the Lone Star state in a last-minute bid for votes.
Traditionally a Republican stronghold, the battle for Texas's 38 electoral college votes is likely to go down to the wire.
President Trump has a slight lead in the state, according to FiveThirtyEight's latest forecast. But that advantage is within the margin of error and a Biden win in Texas could be key to his path to the White House.
Sheryl Cole, a Democrat member of the Texas House of Representatives, said officials cancelled an event set to feature the city's young party members and the Biden campaign.
"This is a first for me," said Ms Cole of the decision to scrap the event. "Unfortunately, pro-Trump protesters have escalated well beyond safe limits. Sorry to all who looked forward to this fun event," she added.
Congressman Lloyd Doggett, US representative candidate Wendy Davis and Austin mayor Steve Adler were among some of the speakers due to deliver remarks at the event.
A Biden/Harris campaign bus made a brief stop in downtown Austin and was heckled by around a dozen president Trump supporters. It was not immediately clear if senator Harris was travelling on the bus.
According to local Democrats, the same group of Trump supporters has been following the bus around the country in an attempt to disrupt events in key battleground states.
Rafael Anchía, a member of the Texas House of Representatives, said some of the agitators had been carrying weapons.
"Armed Trump trolls harassing Biden Bus on I-35, ramming volunteer vehicles & blocking traffic for 40 mins," he said, before accusing Mr Trump's son Eric of inciting "violence".
"At least the Trump hearse is appropriate given the 200K+ Americans who have died due to his incompetence," he added, referencing a vehicledriven by Mr Trump's supporters to antagonise the bus.
The Independent has contacted the Texas Democrat party and Texas state Highway Patrol for comment.
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