National park · est. 1941

Mammoth Cave National Park · caps RVs at 40 ft

Mammoth Cave's tours sell out months ahead — book the tour first, then the 40-ft Mammoth Cave Campground. Green River ferries cap at 16,000 lbs, which rules out most Class A rigs.

RV rentals in Kentucky

Max RV: 40 ft
Season: March – November (Mammoth Cave) · Year-round dispersed

Max RV length: 40 ft
Dump station: On site
Season: March – November (Mammoth Cave) · Year-round dispersed

Going to Mammoth Cave National Park? Tell us the nights.

One email when a Kentucky owner lists a rig for those nights.

Pick-up

Drop-off

The world's longest known cave system runs 426+ mapped miles directly under the park, and ranger-led tours are the only legal way in — every RV trip planning starts with the tour-reservation calendar, not the campsite calendar.

Mammoth Cave Campground (the main developed loop) accepts rigs up to 40 ft, runs dry-camp only, March through November. Houchin Ferry Campground on the Green River is dry-camp with a 30-ft cap. Maple Springs Group Camp can take larger RVs for organized groups. No hookups anywhere inside the park; dump station opens with the main campground season. The Green River ferries (Houchin and Green River) restrict to 16,000 lbs gross — most Class C rigs and travel trailers clear that, most Class A rigs do not.

What the length limit is measuring

Pad length — the rig plus anything it tows
Height — what the branches and the awning need
Turning arc — the swing off the loop road

How the in-park dump station is used

Waste outlet — under the rig, driver side
Ground drain — hose seated, then the valve opens
Rinse standpipe — non-potable, for the hose only

Primary sources

How to book this park

Reservations + adjacent staging

Official reservation portal

Looking for the rig? Browse Kentucky RV rentals on PickRV →

Quick answers

Frequently asked

Can you take an RV into Mammoth Cave National Park?

RVs up to 40 ft are allowed in Mammoth Cave's campgrounds.

Are there RV hookups at Mammoth Cave National Park?

No — Mammoth Cave's campgrounds are dry (no hookups). Fill water and charge before you arrive.

Is there an RV dump station at Mammoth Cave National Park?

Yes — Mammoth Cave has an RV dump station.

Kentucky rules · last verified 2026-05-10

State rental tax: 7% · not collected by PickRV
Min driver age: 21+ std · 25+ Class A
Gravel roads: Allowed — disclosure required
Generator quiet: 22:00-07:00