Steam Valley After Dark: Hiking to Reykjadalur’s Hot River and Northern Lights Soak
Steam, sky and shoreline-free bathing—an easy hike that pays off in rivers warmed by the earth.
The first thing you notice is the breath of the valley—steam rising like a congregation of ghosts, lifting off moss and tussock and falling away into the cold Icelandic night. On a clear winter evening the trail to Reykjadalur becomes a two-act show: a rhythmic hike through graphite-colored hills under a spatter of stars, and a final curtain where the river itself exhales warmth into the dark. When the aurora unfurls above, the whole scene feels calibrated to welcome you: earth warming you from below, sky putting on a slow-motion spectacle above.
Trail Wisdom
Time your arrival for softer light
Start early in summer to avoid crowds and catch golden-hour warmth; in winter, aim for an evening hike if you’re chasing the Northern Lights.
Layer and protect your feet
Trail sections can be boggy or icy—waterproof hiking boots with good tread and gaiters are worth carrying.
Respect thermal zones
Avoid entering areas near fumaroles or steamy vents—water temperature fluctuates and some spots can scald.
Pack a dry-change system
Bring a waterproof bag for wet swimwear, plus a warm, dry layer to change into immediately after your soak.
Local Knowledge
Hidden Gems
- •Walk slightly upstream from the main soak to find smaller, quieter pools with variable temperatures.
- •Short detour trails above the valley offer sweeping panoramas of Hveragerði’s geothermal greenhouses and distant Reykjavík on clear days.
Wildlife
Arctic fox (rare), Various migratory birds like ptarmigan and golden plover
Conservation Note
Visitors are asked to stay on durable surfaces, avoid introducing soaps into natural pools, and pack out all waste—geothermal areas are fragile and erosion-prone.
Reykjadalur has long been part of the Hengill volcanic geothermal system; local communities like Hveragerði have used geothermal heat for greenhouses and bathing for decades.
Seasonal Guide
spring
Best for: Quieter trails, Wildflower patches, Late snowmelt viewing
Challenges: Muddy trails, Unpredictable weather
Spring opens the valley—meltwater and mud can make the trail slippery, but the landscape is fresh and less crowded.
summer
Best for: Full trail access, Warmer midday temps, Long daylight hours
Challenges: Crowds, Limited shade
Summer is the easiest time to hike and bathe; expect more visitors and easier trail footing during long daylight.
fall
Best for: Autumn colors, Fewer crowds, Aurora season beginnings
Challenges: Cooling nights, Shorter days
Fall offers crisp air and a chance at early Northern Lights—pack warm layers for evenings by the river.
winter
Best for: Northern Lights soaks, Snow-dusted landscapes, Atmospheric steam fields
Challenges: Icy paths, Cold exposure risk
Winter’s long nights make aurora-viewing ideal, but be prepared for ice and temperatures that demand solid clothing and planning.
Photographer's Notes
What to Bring
Waterproof hiking bootsEssential
Keeps traction on muddy or icy sections and protects feet from wet ground.
Headlamp (for night hikes)Essential
Hands-free light for approach and changing after dark—guides supply these on some tours.
Swimsuit and quick-dry towelEssential
Essential for soaking; a compact towel and waterproof bag keep things tidy on the return.
Warm, layered clothingEssential
Quick-change layers and a windproof top mitigate cold after a hot soak, especially at night.
Common Questions
How long is the hike to the hot river?
The common approach is 3–6 km round-trip depending on where you start and how far you walk along the valley; most visitors take 40–90 minutes each way at a moderate pace.
Is the river safe to bathe in year-round?
Yes—people bathe year-round, but temperatures vary along the river; avoid areas near fumaroles and respect signage or guide advice because some spots can be very hot.
Are there changing facilities?
There are basic facilities at the trailhead parking area, but no formal changing rooms at the river pool—bring a towel and plan for outdoor changing with a waterproof bag.
Can I see the Northern Lights from Reykjadalur?
Absolutely—on clear, dark nights the valley offers great aurora viewing; guided night hikes can time your soak to maximize that experience.
Is the trail suitable for children?
Families with children can do the hike; many tours list an age limit (often around 8+) and recommend supervising children closely around hot water and uneven terrain.
Do I need to book a guide or tour?
No—you can hike independently, but guides add safety, local knowledge, and logistics for night or winter hikes; booking is recommended during busy seasons or for aurora-focused trips.
What to Pack
Waterproof boots, headlamp (for evening hikes), swimsuit and quick-dry towel, warm change of clothes—protect feet, see in the dark, enjoy the soak, and stay warm afterward.
Did You Know
Reykjadalur means “Steam Valley” and sits on the Hengill volcanic system; the same geothermal activity that warms the river also supplies hot water to nearby Hveragerði’s greenhouses.
Quick Travel Tips
1) Book tours early in high season; 2) Bring waterproof storage for wet swimsuits; 3) Check aurora and weather forecasts before an evening hike; 4) Respect local signage and avoid stepping on fragile moss.
Local Flavor
Hveragerði is a practical complement to a Reykjadalur visit—home to geothermal greenhouses, cozy cafés, and classic Icelandic hot dogs; local guides often pair stories of elves and sagas with practical safety tips.
Logistics Snapshot
Drive: ~40 minutes from Reykjavík; Trail: ~3–6 km round-trip; Elevation: moderate gain; Facilities: basic at trailhead; Best for: hikers wanting a natural hot river and photographers chasing aurora.
Sustainability Note
Stay on marked trails, pack out all trash, never use soaps in natural waters, and avoid disturbing geothermal features—small actions help preserve the valley’s fragile ecosystem.