Quick answer: Korouoma canyon holds 14 named frozen waterfalls, and it is the most important ice climbing area in Finland — climbing is permitted on every one of them, without a permit. You do not need ropes or any climbing experience to see them. A marked 5 km trail called Koronjää descends into the canyon and passes the three largest falls on the route: Jaska Jokunen (50 m), Ruskea virta (up to 60 m) and Mammuttiputous (35–50 m). Our guided day trip walks that trail. We do not climb, and climbing is not part of the tour.
How many frozen waterfalls are there in Korouoma?
Fourteen have names. Metsähallitus, the Finnish state forest and park authority, maps all of them with heights, widths and angles — from Sikariporras (“Cigar Step”, 45 m) to Jäämorsian (“Ice Bride”, 40–50 m).
Not all fourteen appear every year. Precipitation and sub-zero temperatures decide how many falls form and what shape they take, and two of them — Prinsessaputous and Onnekas — are recorded as forming only infrequently.
Three of the largest sit directly on the Koronjää trail:
- Jaska Jokunen (“Charlie Brown”) — 50 m
- Ruskea virta (“Brown River”) — 35 to 60 m depending on the year
- Mammuttiputous (“Mammoth Fall”) — 35 to 50 m
Finland's tallest ice fall is in Korouoma but not on this trail: Kaunein (“The Most Beautiful”), 70 m, stands in the remote Rosvosektori sector, reached by climbers rather than walkers.
Is Korouoma really Finland's main ice climbing area?
Yes. The Finnish Climbing Federation treats it as the country's most extensive ice climbing terrain, and the first ascents here were made between 1984 and 1990. Climbing databases list roughly twenty routes spread across five sectors, at grades running from straightforward water ice up to hard mixed lines.
Metsähallitus permits ice climbing on all the falls in the area, with no permit required — a course is recommended, not mandatory. Rock climbing is treated differently: it is restricted to the western end of the canyon, and the Pirunkirkko cliff is closed entirely from 1 May to 31 July to protect nesting species.
Our own trip walks. The guided day trip follows the marked trail past the falls; climbing is not included and is not possible as part of it. Climbing requires a specialist operator, your own equipment and the training to use it. What we offer is the canyon floor, at close range, on foot.
What the Koronjää trail is actually like
Koronjää is a 5 km loop starting from the Saukkovaara car park. Metsähallitus rates it demanding — a classification that describes the terrain rather than the distance.
The route drops from the canyon rim to the Korojoki river along the bottom, then climbs back out. The steep sections are built up with stairs, duckboards and rope handrails, which is what makes the descent possible in winter at all. Underfoot it is snow over uneven ground, frequently icy. There is nothing vertical and no climbing involved, but it is not a flat forest walk either.
The reward for the descent is scale. From the canyon floor the ice walls stand directly above you, and the sound changes — running water is still moving behind the ice in places, and you can hear it.
Metsähallitus markets Koronjää as Finland's only jäätikköreitti, or glacier trail.
When are the waterfalls fully frozen?
The reliable window runs December to April. Climbers consider the season open from early December in a year with a timely autumn freeze, and it can hold into April.
The ice is at its thickest and most dependable in February and March. Metsähallitus visitor counts show the same pattern from the other direction: of 28,332 visits recorded in 2018, March alone accounted for 7,132 and February 4,028.
Early-season visits in December carry more variation. The falls are forming rather than fully formed, and a mild autumn can delay them. Early ice has its own look — thinner and more translucent, with water often still visible behind it.
Our guided trips run through the winter season; see the tour page for the dates currently open.
What kind of protected area is Korouoma?
Korouoma is part of the Korouoma–Jäniskaira Natura 2000 site, 9,378 hectares in the municipality of Posio, managed by Metsähallitus. Inside it sits a statutory herb-rich forest protection area of 71 hectares.
The reason for that protection is worth knowing before you walk it: calcareous soils in the northern part of the canyon support unusually lush vegetation for this latitude — forest you would not expect this far north. There is no entrance fee and no permit needed for hiking.
The canyon runs about 30 km and drops 100 to 130 metres below the surrounding terrain. It follows an ancient fracture in the bedrock, hundreds of millions of years old, which the Ice Age deepened into the form you walk through today. The Korojoki meanders along the floor and drains eventually into the Kemijoki.
Frequently asked questions
Do I need climbing experience to visit Korouoma?
No. The Koronjää trail is a walking route. Climbing is a separate activity practised on the same falls by people who bring their own equipment and training.
Can I try ice climbing on your tour?
No. Our day trip is a guided hike past the frozen falls. Climbing is not included and is not possible on the tour. Several specialist operators run ice climbing courses in Korouoma if that is what you are after.
How difficult is the trail?
Metsähallitus rates the 5 km Koronjää loop demanding. The difficulty comes from the descent into the canyon and the icy, uneven ground, not from the distance. Stairs, duckboards and rope handrails are in place on the steepest parts, and a guided group walks it at the group's pace.
Which waterfalls will I actually see?
The route passes the three largest falls on the trail: Jaska Jokunen, Ruskea virta and Mammuttiputous. How complete each one looks depends on the winter.
Is there a permit or entrance fee?
No. Korouoma is a protected area open to the public, with no entrance fee and no permit needed for hiking.
Do you need a guide?
Not legally. A guide covers transport from Rovaniemi, reads the ice and trail conditions, and handles the route in winter darkness and cold — which is the practical difficulty rather than the navigation.
About Experience Tours
Experience Tours is a local Arctic adventure operator based in Rovaniemi, Finnish Lapland. We run small-group winter day hikes into Korouoma and Riisitunturi National Park alongside our Northern Lights hunts, with professional local guides, included photography, and a 4.9/5 rating from 760+ reviews.
Book the Korouoma trip: experiencetours.fi/korouoma-frozen-waterfall-tours