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About Us

We are a family owned and operated business. Our company is based on the belief that our customers' needs are of the utmost importance. Our entire team is committed to meeting those needs. We believe that everything happens through people which is why our team is committed to provide you with the best service out there. Diamond J Custom Farming specializes in chopping winter forage, corn silage, haylage, earlage, custom farming, manure spreading and excavating.

Wiebren Jonkman


Luciana Jonkman


Juvenal Rodriguez

General Manager - 

Custom Farming

Photo Coming...

Oscar Nava Badillo

Herd Manager - 


Our Mission Statement:

"Diamond J Farms believes in excellence in farming, harvesting &

manure spreading. We pride ourselves in serving our

customers with the highest degree of honesty, integrity and respect.

We consider the quality of our team to be the key in exceeding

each of our customer and industry expectations."

Contact Information:

Wiebren Jonkman

mobile: (209) 564-0870


(209) 725-2699

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