How Long Does a Cow Need to Eat Grass to Be Considered Grass-Fed?
                                
                                
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                                    4 min read                                
                            
                                With the USDA having withdrawn its specific grass-fed standard in 2016, there is no single, federal requirement for how long a cow needs to eat grass to be considered grass-fed. The definition depends entirely on the specific third-party certifier a producer chooses to follow, or sometimes, no standard at all.