Our Story


Over 40 Years of Simmental History

Clay Lassle was just a junior in high school when he attended a course on artificial insemination. His father, Erwin, had predominately raised Angus cattle. “The Angus cattle were small and lacked performance at the time. We decided to try to add some performance and Simmental seemed like the right fit,” explains Clay. The first Simmental influenced calves were born on the ranch in 1975.

Lassle Ranch Simmentals (LRS) is a family-run operation 20 miles west of Glendive, Montana. Marianne, Clay’s wife of over 40 years, is an integral part of the operation. She keeps the books and keeps Clay in line. In 2017, Clay and Marianne’s oldest daughter Sarah, her husband Ryan, and their two daughters, Grace and Harper, returned to the ranch full-time.

Clay & Marianne’s other children; Stephanie and her husband Scott and Travis and his wife Alix and their children come back to the ranch often to help.

One of the Most Respected Prefixes in the Simmental Breed…

LRS believes in the power of the data and information. Through the American Simmental Association’s Cow Herd Roundup, they have focused on collecting DNA on every calf born at the ranch. Each year they enroll one of their young herdsires in the ASA’s Carcass Merit Program and in 2021 took it to the next level by making the decision to retain ownership on their steers to give their customers ever more confidence in how their cattle will perform on the rail. This coupled with their extensive use of A.I. and embryo transfer along with their commitment to taking and reporting accurate physical measurements to the breed association all help make LRS one of the most respected in the Simmental breed. When their customers purchase a bull, they can be assured that they are getting what they expect, but if they ever have a problem they will be backed by a 100% satisfaction guarantee.


Stop by and see us

LRS runs about 350 mother cows, both percentage and purebred Simmentals,
and sell 120 – 130 bulls per year.

They welcome visitors anytime – stop by and see them just 2½ miles off I-94!

Contact us

We’d love to hear from you!

Call us anytime
Clay: 406-486-5584
Ryan: 406.694.3722
Sarah 406.694.3760

Send an eMail  
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42 ROAD 245