Cross Country Skiing (FIS) — Official Rules

Cross-Country (XC) skiing is an endurance racing sport in which competitors travel a marked snow course over their own muscular power, using skis and poles only, climbing, descending and crossing rolling terrain. A competitor must cover the whole distance on skis and follow the marked course in the correct sequence, passing every control point. The result is decided either by elapsed time (interval-start races) or by finishing order (mass-start, pursuit, sprint-heat and relay races): in time races the lowest total time wins, and in order races the first across the finish line wins. There is no goal-scoring; ranking is by speed alone.

Cross-Country skiing is governed worldwide by the International Ski and Snowboard Federation (FIS). These rules - ICR Book II (Cross-Country), Edition October 2025, approved by the FIS Council - apply to all FIS Calendar competitions; at the Olympic Winter Games they apply except where the IOC stipulates otherwise. They are mandatory for the World Cup, FIS Nordic World Ski Championships, Tour de Ski, Continental Cups and the 2026 Olympic Winter Games (Milano-Cortina). The ICR is complemented by the FIS Cross-Country Points Rules and the Specifications for Competition Equipment.

Classical (C) technique is the traditional diagonal-stride style in which the skis travel parallel within set tracks, propelled by a forward kick-and-glide and double-poling. Skating (lateral push-off) movements are prohibited in classical races except where explicitly allowed (e.g. on marked skating zones at sharp corners). Going uphill, the herringbone step is permitted only while the skis do not glide; once a ski begins to slide, the action is treated as a prohibited free-technique movement. Classical races allow grip wax (kick wax) to be applied to the ski's wax pocket.

Free (F) technique places no restriction on the style of movement: competitors normally use the faster skating action - angling the skis outward and pushing off laterally with a glide. There are no set tracks to follow, and the whole prepared trail width may be used. Because no grip wax is needed, waxing, scraping or cleaning of skis during a free-technique competition is forbidden; only glide wax applied before the start is used. Most modern XC distance races and all relays mix the two techniques.

A headline change for the 2025/26 season and the Milano-Cortina 2026 Olympic Winter Games is the full equalisation of men's and women's distances: women and men now race the same official distances in every format (e.g. 10 km, 20 km, 50 km, 20 km Skiathlon). The official individual distances are 10 km, 20 km and 50 km; the Skiathlon is 20 km (10 km classical + 10 km free). Each course is built from standard ski loops (commonly 2.5 km, 3.3 km or 5 km) repeated to make up the race distance, passing through the stadium once per loop.

In an Interval (single) Start race, competitors leave the start one at a time, normally at 30-second intervals (15 s may be used). Each races alone against the clock over the full distance (e.g. 10 km) in either classical or free technique. The official clock runs from each competitor's scheduled start time, so a competitor who starts late loses those seconds. Start order is set by FIS points / World Cup standings groups. The lowest total time wins.

In a Mass Start, the whole field starts simultaneously from a fan-shaped or gridded start, with the highest-ranked competitors in the front lanes (often shaped into classical tracks for a classical race). Mass-start distances include the 20 km and 50 km. There is no individual clock against the field: the first competitor across the finish line wins, so tactics, drafting and the final sprint are decisive. The 50 km is the marathon showpiece of the sport and the traditional Olympic closing race.

The Skiathlon is a 20 km mass-start race split into two equal halves of different techniques: 10 km classical, then 10 km free. At the midpoint each competitor enters the pit / exchange zone and changes equipment - swapping classical skis (and usually poles) for skating skis - without outside assistance other than that allowed, then rejoins the course. The time spent in the pit counts toward the total. The first across the finish line wins. The mid-race ski change is the Skiathlon's signature challenge.

A Pursuit combines two races run on different days. After a first race (e.g. an interval-start classical leg), the second leg is started as a pursuit start: the leader sets off first and every other competitor starts behind by exactly the time gap they recorded in the first leg, so the first across the finish line is the overall winner. The two legs are usually skied in different techniques (classical then free). The Skiathlon is effectively a single-day version of the same idea.

The Individual Sprint is a short, explosive race on a course of roughly 1.0-1.8 km (about 1.6 km at the Olympics), in either classical or free technique. It begins with a qualification run as an interval start (timed individually); the fastest 30 competitors advance to the knock-out rounds. Qualification times do not carry over into the heats - only the order of finishing in each heat counts thereafter.

The 30 qualifiers are drawn into five quarterfinal heats of six (6) competitors. From each quarterfinal the two fastest advance, plus the two fastest 'lucky losers' across all quarterfinals, giving 12 skiers in two semifinal heats of six. From the semifinals the two fastest in each heat advance, plus two lucky losers, to make the six-skier final (A-final). The first across the finish line in the final wins; the remaining places are filled by heat results. Sprint heats are mass-started head-to-head.

The Team Sprint is run by teams of two athletes who alternate legs on the sprint loop, each skiing three legs (six legs total) and handing over by tagging their partner in the exchange zone. It is contested as a semifinal then a final (about 15 teams in the final) in either technique. As in all relays, the first team's anchor across the finish line wins. Obstruction or a tag made outside the exchange zone is sanctioned by the Jury.

A Relay is a four-leg team race. The standard distance is 4 x 7.5 km (Olympic and World Championship standard, equalised for both genders). The four legs are skied in a fixed technique split: legs 1 and 2 in classical technique, legs 3 and 4 in free technique. The Mixed Relay combines women and men in one team. Teams start with a mass start of all first-leg skiers together.

A leg ends with a valid exchange: the incoming skier must touch (tag) the outgoing team-mate with the hand while both are inside the marked exchange zone. A tag made outside the zone, missing the partner, or an exchange that obstructs other teams is an infraction. A relay exchange infraction is sanctioned by a minimum 30-second time penalty added to the team's result, or by disqualification for a serious or deliberate breach. The anchor (fourth) leg finishes the race.

An XC course must combine uphills, undulating terrain and downhills in roughly equal thirds, with no single climb dominating. Each homologated course has defined limits on Maximum Climb (MC), Total Climb (TC, Height Difference HD) per lap and Partial Climb (PC). The course must be wide enough for skating and overtaking (a minimum prepared width, wider for mass-start and skating events) and, for classical races, must include set classical tracks. The stadium holds the start, finish, exchange and pit zones, which competitors pass once per loop.

Every course used for a FIS Calendar competition must be homologated (certified) by FIS and carry an official homologation number before it may host a race. The homologation certificate records the loop layout, lengths, climb values, width and required safety installations. A competition must use a homologated course of the level appropriate to the event (Olympic / World Championship / World Cup courses meet the strictest standards).

FIS XC uses four start types: (a) interval (single) start, competitors leaving at fixed gaps (normally 30 s); (b) mass start, the whole field together from a grid; (c) pursuit start, with the time gaps from a preceding leg; and (d) the relay tag start in the exchange zone. In an interval start an early start must be corrected behind the line; in a mass or pursuit start, crossing the line before the start signal is a false start corrected by the start judges, and a deliberate false start may be penalised.

Competition time runs from the start (scheduled interval time, or the start signal in mass/pursuit/relay) until the front of the leading foot/boot crosses the finish line, recorded by transponder timing and a finish photocell. In sprint heats and tight mass-start finishes a photo finish decides the order. Times are taken to high resolution; in interval-start races the lowest total time wins, while in heats and mass starts finishing order decides. Genuine ties share the same rank.

Electronic timing records intermediate (split) times at fixed points on each loop, driving the live standings, the time gaps between competitors and the broadcast graphics. Splits also support the seeding of pursuit starts and the analysis of lap-by-lap pacing during the race.

Obstruction is not allowed in any competition. Obstruction is deliberately impeding, blocking, charging or pushing another competitor with any part of the body or ski equipment. A skier being overtaken must give way on first call in interval-start races (and on prepared free-technique trails must not change track repeatedly to block). In mass-start, pursuit and relay races a competitor about to be lapped by the leader must yield immediately. Deliberate obstruction is sanctioned by the Jury with a time penalty or disqualification.

In classical-only races, any skating action to maintain or increase speed (outside permitted skating zones) is a technique violation; an official posted on the course records the bib and may signal the competitor. A first violation may bring a warning (yellow card); two violations (yellow cards) in one race lead to disqualification. A competitor must follow the marked course in the correct sequence: leaving it, changing course or skiing backward to gain advantage is forbidden; if a skier deviates they must return to the point of error by skiing against the direction if necessary.

A competitor is disqualified (DSQ) for serious breaches: changing course, interfering with or obstructing an opponent, two technique-violation cards, illegal equipment, missing a control point, accepting prohibited outside assistance, doping or unsporting conduct. A competitor who does not appear at the start is DNS (Did Not Start) and one who abandons the race is DNF (Did Not Finish); neither is classified. All sanctions and reasons are recorded in the official competition documents and the audit trail.

Both skis of a pair must be built the same way and be the same length, and a pair of XC skis must weigh at least 750 g (without bindings). Poles must have a constant length and must not create foreign energy to aid push-off. For the classical technique, the pole length is limited: the upper edge of the pole grip strap may be no higher than 83% of the competitor's body height measured standing in ski boots, to preserve the diagonal-stride character. Pole tips must use safe XC tips or a rigid protective tip of diameter ≥ 30 mm. Skis are marked at the pre-start control and verified at the finish.

Since the 2023/24 season, FIS applies a complete ban on fluorinated (PFAS / C8 and C6) ski waxes in all disciplines for environmental and health reasons. Skis are tested for fluorine before the start using a portable infrared (FTIR) spectrometer; a positive reading above the threshold means the ski may not be used, and a competitor who races on fluorinated skis is disqualified. The Milano-Cortina 2026 Olympic Winter Games are the first Games run fully fluoro-free.

Competitors must wear the official bib (start) number, leg numbers and a timing transponder, and may not carry communication or listening devices used to gain advantage during the race. A competitor must complete the course by their own means of propulsion: only permitted outside assistance (e.g. authorised equipment service in the Skiathlon pit, or feeding/drinks at marked stations) is allowed; any other outside help, pacing or pushing by a non-competitor is forbidden and sanctioned by the Jury.

Each FIS event is led by a Technical Delegate (TD) and a Jury chaired by the TD with the Chief of Competition and a Referee / FIS representative. Specialist officials include the Chief of Competition, Chief of Course, Start and Finish Referees, Stadium and Exchange-zone controllers, and on-course technique controllers. The Jury sets start lists and course details, applies sanctions and disqualifications, rules on protests, and approves the official results. Its decisions are final within the rules, subject to the protest and appeal procedure.

A team may file a protest within the time limit set in the rules (a short window after the posting of provisional results or the event in question), accompanied by the prescribed fee. The Jury decides protests; its decision may be appealed to the FIS Appeals Commission within the stated deadline. Provisional results become official once all protests and the protest window are resolved. Decisions on technique violations and obstruction must be supported by the controllers' records / evidence.