Ahead of his Udupi rally, Modi is scheduled to visit Krishna matha and meet the senior seer there.
At least 15 rallies are expected to follow in the coming days. The campaigns aim to unseat the Congress from power and form its government in the southern state for the second time.
On Monday, Chief Minister Siddaramaiah posed questions to Modi on Twitter while welcoming him to the state.
"Dear @narendramodi, Heard you are visiting Namma" Karnataka tomorrow. We welcome you to our state. While you are" here, we Kannadigas would like you to address the following" concerns. Please #AnswerMaadiModi," Siddaramaiah tweeted.
Polling for the 224-member Assembly will be held on May 12, and results will be"declared on the 15th of the month.