Wounded Cowboy by Ophelia Sexton

After a collapsed treehouse injures little April and Abby Snowberry, widower Zach Snowberry reluctantly hires a nanny to watch his girls. Frustrated and unable to balance his new job as a ranch manager with being a single dad, he hires the annoyingly perky and feisty Kelsey Armstrong to watch his girls. Kelsey has a reputation for softening even the hardest hearts, but his is made of ice and nothing she can do will ever melt it.
Forced to share close quarters, the two are at odds from the get-go. Kelsey sees Spring’s pain behind his grumpy demeanor, and she wants to help him. Too bad she’s planning on leaving Montana as soon as she saves enough money to get to L.A. Falling in love isn’t in her plan, but as she and Spring spend more time together, she wonders if she’ll lose her heart to the sexiest man in Snowberry Springs.