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The referee’s arm shoots up. Everyone in the stands knows what that means: a delayed penalty, and the goalie is already racing to the bench for an extra attacker. A few seconds later a dad two rows back is yelling “offside!” at a play that wasn’t. Hockey’s rules make sense once you see them a few times, but they change in important ways from a mite game to high school, college, the NHL and the Olympics. Here are the ice hockey rules in plain words: the basics, the positions, offside and icing, penalties, how NHL vs IIHF vs NCAA vs high school rules differ, the ages when body checking starts, and what changed for the 2026 season.
For the big picture of the sport at every level, start at our ice hockey hub.
The basics: rink, periods and scoring
Each team has six players on the ice: five skaters and a goalie. An NHL rink is 200 feet long and 85 feet wide; an IIHF international rink is 60 meters long and 26 to 30 meters wide, a little wider than most North American rinks. Two blue lines divide the ice into three zones (defending, neutral and attacking), and the red line marks center ice. A goal counts when the whole puck crosses the goal line between the posts and under the crossbar. You can’t kick it in or bat it in with your hand, and in high school and USA Hockey youth games directing it in with a skate isn’t allowed either.
The puck is vulcanized rubber, about 1 inch thick and 3 inches across, weighing 156 to 170 grams (about 5.5 to 6 ounces) under IIHF rules. Games are three periods: 20 minutes in the NHL, college and international hockey; 15 minutes in high school (states may allow up to 17); and up to 20 minutes in USA Hockey youth games, often less for younger ages.
Hockey positions explained
- Center: takes most faceoffs and plays both ends of the ice, supporting the defense deep in its own zone.
- Wingers (left and right): forwards who work the sides of the ice, chase pucks in the corners and score many of the goals.
- Defensemen: two players who protect the front of the net, block shots, move the puck up ice and run the blue line on offense.
- Goalie (goaltender): the only player allowed to freeze the puck with the glove, wearing much bigger pads and a reinforced mask. Since 2024-25, high school goalies must wear both a neck laceration protector and a throat protector.
Forwards play in lines of three and defense in pairs, changing on the fly while play goes on. Young players in USA Hockey’s American Development Model are encouraged to try every position.
Offside, icing and penalties
Offside: attackers can’t enter the attacking zone ahead of the puck. What counts is the skates, not the stick: a player is offside when both skates are completely over the blue line before the puck. Most levels use a “delayed” offside, letting attackers leave the zone and tag up instead of stopping play at once; in USA Hockey that applies from 15-and-older youth and 16U girls and up.
Icing: a team at even strength or on the power play can’t shoot the puck from its own half past the opponents’ goal line. The NHL (since 2013-14), college and IIHF play a “hybrid” version: the linesman stops play if a defender would win the race to the puck, which cuts down on dangerous crashes into the end boards. High school and USA Hockey youth games stop play as soon as the puck crosses the goal line. A shorthanded team may ice the puck at most levels, but not in USA Hockey 14U and younger.
Penalties: a minor sends a player off for 2 minutes and a major for 5, while the other team plays the power play. A misconduct is 10 minutes for the player, but the team doesn’t play short. A game misconduct or match penalty (disqualification in high school and college) ends a player’s game. A penalty shot gives a player a free one-on-one with the goalie when a clear scoring chance is taken away by a foul.
NHL vs IIHF vs NCAA vs high school: the key differences
| Rule | NHL | IIHF (international) | NCAA (college) | High school (NFHS) | USA Hockey youth |
|---|---|---|---|---|---|
| Period length | 20 min | 20 min | 20 min | 15 min (up to 17 by state) | Up to 20 min |
| Tie after regulation | Regular season: 5 min 3-on-3, then shootout. Playoffs: 20-min periods until a goal | 5 min 3-on-3 (10 min in playoff rounds), then shootout | 5 min 3-on-3, then shootout | Set by each state | Up to 10 min; 5-on-5, 4-on-4 or 3-on-3 |
| Face protection | Visor for players with fewer than 25 games (since 2013-14) | Visor minimum; full cage or shield under 18 and for women | Full face mask | HECC-certified helmet and face mask | HECC-certified helmet and face mask |
| Neck guard | Recommended | Required for all players | Not required until 2027-28 | Required | Required |
| Mouthguard | Not in the rulebook comparison we used | Recommended (required in U20 without full face protection) | No rule | Required, colored | Required 12U and older, colored |
| Fighting | 5-minute major | 5-minute major plus game misconduct | Disqualification | Disqualification | Minor, double minor, or major plus game misconduct |
| Icing | Hybrid | Hybrid | Hybrid | Immediate whistle | Immediate whistle |
A few more differences that confuse fans: the hand pass is legal in your own defending zone in high school and USA Hockey but not at all in the NCAA, and high school allows a “mercy rule” that NCAA and USA Hockey don’t. In USA Hockey, every major penalty also carries a game misconduct, and a player who hits the four-penalty limit in a game is done for the night.
Body checking: at what age, and where
- USA Hockey: legal body checking starts at 14U in boys’ and co-ed checking leagues. Since 2011-12 it has been banned at 12U and younger, in all girls’ and women’s classifications, and in non-check adult leagues. Even where it’s allowed, USA Hockey defines a check as a play on the puck, with the stick below the knees.
- Hockey Canada: no body checking at U13 and below since 2013; it starts at U15 in body-checking leagues, and some house leagues offer non-checking hockey at every age.
- Women’s hockey: USA Hockey girls’ and women’s games and NCAA women’s hockey don’t allow body checking. The IIHF and the PWHL allow body contact when a player is clearly playing for the puck, but not hits to take a player out of the play.
- High school, college, junior and pro men: body checking is legal, but checking from behind and contact to the head are penalized at every level, with majors or ejections for the dangerous ones.
The ages came from research: a 2010 study found more than three times the injury and concussion risk for 11- and 12-year-olds in a league that allowed checking. Our youth hockey page explains what that means for parents, and the hockey injuries page covers concussion.
What changed for 2026
- NHL: the 2026-27 season is the first with 84 regular-season games, up from 82, under the new labor agreement that starts on September 16, 2026.
- NCAA (2026-27 and 2027-28 rules): a second major penalty in a game is an automatic game misconduct; a player who deliberately takes off their helmet during play gets a minor, and a goalie who does it on a breakaway gives up an awarded goal; Division I men add the goalie trapezoid behind the net; and all players must wear cut-resistant neck, wrist and sock protection starting in 2027-28.
- USA Hockey (2025-29 rulebook): delayed offside with tag-ups and icing by a shorthanded team now apply in Youth 15 and older and Girls 16U and older, and neck laceration protection is required for all youth, girls’ and high school players.
Gear for refs, coaches and pond hockey
Coaches and referees still swear by the Fox 40 Classic, a pealess whistle that works when wet or cold (about $8). For practice and pond hockey, a bucket of regulation 6-ounce pucks like the Howies pucks (sold from single pucks to cases) saves chasing the one you lost in a snowbank, and a roll of Howies cloth stick tape (about $10) keeps your blade grippy. Prices change often. These are what we saw on Amazon in October 2026.
Howies Ice Hockey Pucks
- Official 6 oz (170 g)
- Packs from 1 to 100
- Black vulcanized rubber
Howies Cloth Hockey Tape
- 1 in × 24 yd roll
- Cloth, hand-tearable
- About $10
Helmets, neck guards and skates are on our ice hockey gear page; the leagues that write these rules are on hockey leagues and associations. Also follow soccer? See our soccer rules page.
Ice hockey rules questions
How many periods are in a hockey game?
Three. They’re 20 minutes each in the NHL, college and international hockey, 15 minutes in high school (up to 17 where the state allows), and up to 20 minutes in USA Hockey youth games.
What is icing in hockey?
Shooting the puck from your own half past the other team’s goal line when you’re not shorthanded. Play stops and the faceoff goes back to your end. The NHL, college and IIHF use hybrid icing, which is called early if a defender would win the race to the puck.
When does body checking start in youth hockey?
At 14U in USA Hockey boys’ checking leagues and at U15 in Hockey Canada body-checking leagues. It isn’t allowed in USA Hockey girls’ and women’s hockey at any age.
Is fighting allowed in hockey?
The NHL penalizes a fight with a five-minute major. International hockey adds an automatic game misconduct, college and high school players who fight are disqualified (with at least a one-game suspension), and USA Hockey youth rules go up to a major plus game misconduct.
Do NHL players have to wear visors?
Players who entered the league from 2013-14 on, with fewer than 25 NHL games at the time, must wear one. Neck guards are strongly recommended in the NHL but not required, unlike youth, high school and international hockey.