That's about what my pasture is. It depends how lush it is. If it's been hot and the grasses are drying out or dried already it'll be OK. What's it look like? wide open, trees, shrubby? Wild grasses? or has it been planted with something?
Mostly open with some trees. Wild grasses. No shrubs. We each have 14 acres on the end with 20 acres of community pasture between us. They want to rotate 4 pastures. This is all new to me. The horses on about an acre now.