Our Story

We’re Seth and Mica Nitschke, family ranchers in Central California. We founded Mariposa Ranch, formerly Open Space Meats, in 2006 after Seth had spent many years in the conventional cattle business. After a time spent on a small grass-fed beef farm in Western Australia, Seth decided to bring the cattle care and harvesting methods to the United States.

At Mariposa Ranch, we work with great respect for the environment and with the cattle in our care. We never use hormones, antibiotics or feed grains to our cattle. We don’t use herbicides, pesticides or commercial fertilizers on our pastures. All of our cattle are 100% Pasture Raised, Pasture Finished, Grass Fed Beef from California!

Open Space Meats Grass Fed Beef:
The Hornitos Ranch


If​ ​you​ ​want​ ​to​ ​see​ ​where​ ​your​ ​beef​ ​comes​ ​from,​ ​view​ ​our photo ​gallery​ ​or​ check out our ​videos​ ​to​ ​watch​ ​the​ ​tours​ ​of​ ​our​ ​ranches.

Ranch Tour


Earth DayFood for thoughtRanch
September 16, 2019

Some Practical Thoughts on Cow Farts

It has been a topic lately that eating meat is bad for the environment.  Specifically targeting beef because of the methane being produced by “Cow Farts”.  I think it may…

August 21, 2019

Texas Style BBQ Brisket

From: Epicurious  Cooking Time: 4-6 hours Serves: 4 Ingredients: 1 Mariposa Grass Fed Beef Brisket 1 tablespoon coarse salt (kosher or sea) 1 tablespoon chili powder 2 teaspoons sugar (optional) 1…

Food for thoughtUncategorized
October 13, 2018

National Farmer Day was Oct 11th

Oct 11 is (was) National Farmers Day.  I don’t know about you, but my social media was full of “If you ate today.  Thank a farmer (rancher)” or something like…