From their website: https://dnr.maryland.gov/publiclands/Pages/western/Greenbrier/Day-Use.aspx Day-use Service Charges Memorial Day Weekend-Labor Day - weekdays $3 per person, weekends/holidays $5 per person Labor Day-Memorial Day Weekend - $3 per vehicle May and September Weekends - $3 per person. Note: Out-of-state residents add $2 to all day-use service charges.
Its $3 for in state resident and any child in car seats are free. I can't remember what out of state resident cost.
Thanks! Your answer is awaiting moderation.