Running mainly on private land, the Herajärvi Trail is governed by everyman's right (www.ym.fi, pdf-file 982 kt). The Koli National Park area is governed by the park's rules.
Please familiarise yourself with everyman's right and the Koli National Park rules before setting off on an excursion.
The Herajärvi Trail is available when the ground is unfrozen. The amount of snow varies from year to year, but the trail is usually open from May until November. If you are planning a hike early in the spring or late in the autumn, you should check the snow situation at the Koli Nature Centre Ukko before setting off.
Lighting campfires is forbidden if a forest fire warning is in effect.
Making open fires is always prohibited at both marked campfire sites and when fires are permitted by the land owner if a forest fire warning has been issued for the area (ilmatieteenlaitos.fi).
This prohibition does not apply to cooking shelters or other fireplaces with a flue.
It may not be possible to cross the River Herajoki during the spring and autumn floods, and the wading cable is unavailable in that situation. You can get round the wading cable section by using Herajoentie, the bridge and Vaaralahdentie. If you skip the wading cable and climbing onto Hirvivaara Hill and, after Vesivaara Hill, go along Herajoentie to the Rekilammentie crossroads, the length of the section to walk along the road is 3 km, and the hike is shortened by roughly one kilometre.
Mobile Phone Coverage
Although Finland has a broad network for mobile phones, there are some areas in the trail without signal. There may also be some smaller spots where there is interference. If this happens try to climb to a higher place or go into an open area. It may be worth removing the SIM card from your phone and then trying again to make emergency call. Different phones also differ in their coverage.
We recommend that you keep your mobile phone warm at all times and take along food and drink. Certain phone models do not work when the temperature falls below zero. You should therefore let someone know your planned route. To keep your mobile phone charged, bring along a spare power source, a spare battery or an old phone with a working battery.
Places to get drinking water along the Herajärvi Trail are: Koli Nature Centre Ukko, Ikolanaho well, Kiviniemi well, Seppälä well and Sammakkovaara well.
Only Kiviniemi well and Visitor Cetre Ukko the water is suitable for drinking without boiling.
Water in Seppälä well should be boiled before drinking.
The surface water from the lakes, rivers and brooks must be boiled before use. Water in the springs and running water in the brooks is usually good for drinking. However, the quality of the water cannot be monitored, so the use of natural water is at your own risk. You should boil water taken from unchecked wells and springs.
We recommend taking bottles of tap water with you before setting off. Tap water is available at the Visitor Centre Ukko and Kiviniemi.
Rocky sections and the bridges, stairs, duckboards and other structures that make the trail easier to walk may be slippery in wet weather.
When using the Herajoki wading cable and the Sikosalmi rope-pulley ferry, you must be careful and follow the instructions.
The Herajärvi Trail is available when the ground is unfrozen. Crossing the River Herajoki with the wading cable and the Sikosalmi inlet with the rope-pulley ferry can only be done when the water is unfrozen. If you are planning a hike early in the spring or late in the autumn, you should check the availability of the wading cable and rope-pulley ferry at the Koli Nature Centre Ukko before setting off.
Snow usually melts at Koli in early May. The northern slopes keep their snow cover longer than the southern slopes.
Demanding due to the differences in altitude, the trail is harder to walk in hot summer weather.
The autumn colours at Koli are at their best from late September to early October.
The Herajärvi Trail is a popular hiking trail that is visited by some 5,000 people between 1st May and 30th October.
Emergency number 112
In case of an emergency along the way, for example if you get lost or injured or see a forest fire, dial 112. Detailed instructions.