The Rocky Mountain Folks Festival at Planet Bluegrass ranch in Lyons, Colo. is consistently one of the state’s most enjoyable summer weekends, if only for its picturesque atmosphere on the banks of St. Vrain Creek.

Though with today’s lineup additions, the 22nd incarnation of the fest may be among the top musical bills to hit the front range between Memorial Day and Labor Day.

Iron & Wine, Neko Case, Justin Townes Earle and Kathleen Edwards lead the final round of artists scheduled to play the Aug. 17-19 festival, Planet Bluegrass told Reverb this morning.

The four acts join previously announced headliners Lyle Lovett, Amos Lee and Dawes. Less than 100 3-day passes ($125) remain for the weekend, and single-day tickets, $55, are available Tuesday through bluegrass.com.

Full lineup:

* Lyle Lovett * Amos Lee * Iron & Wine * Neko Case * Justin Townes Earle * Kasey Chambers * Dawes * Kathleen Edwards * Darrell Scott * Peter Himmelman * Holly Near * Richard Shindell * Girlyman * Gretchen Peters * The Dunwells * Elephant Revival * Milk Carton Kids * Caleb Hawley * Songwriter Showcase

Follow our news and updates on Twitter, our whereabouts on Foursquare and our relationship status on Facebook. Or send us a telegram.

John Hendrickson is the managing editor of Reverb and an award-winning journalist at The Denver Post. Follow his rants on music and more on Twitter.