Newnes Glow Worm Tunnel Guide: A Subterranean Galaxy in Wollemi
Deep within the rugged canyons of Wollemi National Park, an abandoned railway tunnel from the early 1900s has been transformed into one of nature's most spectacular light shows. The Newnes Glow Worm Tunnel, a curved passage of almost 400 metres carved through solid sandstone, is now home to thousands of glow worms that create a "starry night" effect in the pitch black. It's one of the places we cover in Hidden Gems NSW.
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This isn't just a walk; it's a journey past industrial history, towering "pagoda" rock formations and fern-filled canyons.
How to Get to the Glow Worm Tunnel: Two Very Different Routes
Depending on your fitness level and your vehicle, you have two ways to reach the tunnel.
1. The "Easy" Way (Newnes Plateau)
This is the most popular route. From Lithgow you drive in via Clarence and the Old Bells Line of Road, then along Glowworm Tunnel Road (or take State Mine Gully Road out of Lithgow).
- The Drive: Expect close to 30km of unsealed gravel road and a narrow single-lane tunnel just before the car park. A 2WD is fine in dry weather, 4WD is recommended, and NPWS says 4WD is essential when the road is wet. No long vehicles.
- The Walk: NPWS lists the Glow Worm Tunnel walking track as 6km return (allow 2 to 3 hours, grade 3), following the old railway formation to the tunnel entrance.
2. The "Hard" Way (Wolgan Valley)
For a bigger day, start at the Newnes Campground in the valley.
- The Walk: The Glow Worm Tunnel via Wolgan Valley loop is a 9km hike through the spectacular Penrose Gorge, with a long, steep climb, but the views of the sandstone cliffs are unparalleled.
Glow Worm Etiquette: Protecting the "Stars"
Glow worms are easily stressed. If they feel threatened, they "switch off" their lights, and it can take hours for them to return. To help the colony survive:
- No White Light: Never shine a torch at the ceiling. Use a red light or point your torch only at your feet.
- Silence is Golden: Keep noise to a minimum. Glow worms are sensitive to sound.
- Hands Off: Don't touch the walls or the glow worms, and stay on the path.
- No Smoking or Vaping: Smoke is toxic to the colony and the delicate ecosystem of the tunnel.
- The "Blackout" Moment: Once you reach the centre of the tunnel, turn off all lights and wait a couple of minutes. Your eyes will adjust, and the "galaxy" will reveal itself.
What Else to See Nearby
- The Pagodas: The area is famous for its "beehive" sandstone formations. Stop at the lookouts along the plateau road for some of the best cliff views in the Blue Mountains region.
- The Newnes Industrial Ruins: If you take the Wolgan Valley route, spend some time at the remains of the old oil shale works, a true "ghost town" vibe. Stay on the track and leave the ruins undisturbed. (The separate Glen Davis Shale Oil Works, further north, is private and can only be visited on a booked weekend guided tour.)
Tips for Visiting the Glow Worm Tunnel
- Check the Alerts: Wollemi and the neighbouring Gardens of Stone area are prone to landslides, road closures and works after heavy rain, and parts of the surrounding plateau are currently closed for roadworks and new visitor facilities. Always check the NSW National Parks Glow Worm Tunnel page and its alerts before you leave Lithgow.
- Phone Reception: Reception is very limited once you leave the highway. Download your offline maps and tell someone where you're going.
- Waterproof Everything: The tunnel floor is uneven, rocky and often wet and muddy. Wear sturdy, waterproof hiking boots and bring a torch, water and a raincoat. There's a non-flush toilet at the car park but no drinking water.
Newnes Glow Worm Tunnel FAQs
How long is the Glow Worm Tunnel walk?
From the Glowworm Tunnel Road car park, NPWS lists the walk as 6km return, taking 2 to 3 hours. From the Wolgan Valley side, the loop via Penrose Gorge is 9km with a steep climb.
Do you need a 4WD to get to the Glow Worm Tunnel?
Not in dry weather: the unsealed road is suitable for 2WD when dry, though 4WD is recommended. When the road is wet, NPWS says 4WD is essential.
Can you use a torch in the Glow Worm Tunnel?
Yes, to walk safely, but keep it pointed at the ground or use a red light. Switch it off to see the glow worms, and never shine it at the ceiling.
How long is the tunnel?
The old Wolgan Valley Railway tunnel is about 390 metres long and curves, so the middle is completely dark.
