The amount of land you have available and the needs of your horses will help you determine the best size for your pastures. On smaller pieces of land, consider keeping the pastures smaller to accommodate frequent rotation, which will allow each pasture to re-grow during a resting period. This can also be accomplished by subdividing a larger field with temporary electric hot tape fencing. Young active horses benefit from having sufficient room to run and play. This can be accomplished with ½ acre to 1 acre fields, or even in a long skinny pasture. On larger pieces of land we recommend pastures up to about 5 acres. Larger fields require more diligent maintenance to check fencing and weed control as you are less likely to observe those things during a regular trip to the pasture.