Ullestad, who hails from Jewell, Iowa, posted a second-round 2-under 69 to get to 3 under for the tournament. He would have had the outright lead but for a bogey on the last hole. Instead Ullestad shares the top spot with Tripp Kenney of Des Moines, who went bogey-free for a 4-under 67 on Tuesday.
First-round leader Andrew Husemen, of Ankeny, fell from 67 to 74 in the second round. He is tied for third with Matthew Walker, who got to 1 under with rounds of 71-70.
Ryoto Furuya of Iowa City and Jon Brown are both at even par to round out the top 5. One round remains before a champion is named.
