Parents and teachers trying to save an outdoor residential centre have submitted a petition backed by almost 7,000 people to Warwickshire County Council.
The local authority is considering closing Marle Hall, a stately home near Snowdonia, Wales, it has owned since 1971.
Campaigners say thousands of children have explored the mountains and coast near the 35-acre site and it had provided "life-changing experiences".
They said supporters' comments included one saying the resource would be "even more vital" to children's health "after the stress and trauma of Covid".
The council said it had finished its consultation with staff and would make a decision on the centre after analysing their feedback.
It added "whatever is ultimately decided around Marle Hall", a residential break "remains a key component of any outdoor education strategy for Warwickshire’s schoolchildren”.