Many players mistakenly believe they can hold onto Risk cards indefinitely to build up a massive army, but the rules actually mandate trading them in under certain conditions.
According to the Hasbro Gaming Official Rulebook, you must trade in at least one set if you have 5 or 6 cards at the beginning of your turn.
Regarding the requirement to trade in Risk cards, the official rules state that while you may choose to wait after collecting a set of 3, a mandate exists if your hand grows. Specifically, if you have 5 or 6 cards at the beginning of your turn, you must trade in at least one set. If you possess two sets within those 5 or 6 cards, you may choose to trade in a second set as well. The value of these sets is determined by the total number of sets traded in by any player throughout the game, not just by the individual player (Risk Rules 2022, [page not specified]).
Example Play Situation
Alice has 5 Risk cards at the start of her turn. According to the rules, she must trade in one set of three cards to receive armies. Bob, on his turn, has 3 cards and chooses to wait, which is permitted because he has not reached the 5-card threshold.
Common Misconceptions
Waiting to trade in cards is always allowed
You only trade in cards when you want to attack
The value of a set depends only on your own trades
Quick Reference
You Can
You Cannot
Trade in at least one set if you have 5 or 6 cards
Do not hold 5 or 6 cards without trading in a set
Trade in a second set if you have two sets within 5 or 6 cards
Do not assume your first trade is worth the same as the tenth
Use the bottom edge of the board to track the next trade value
Frequently Asked Questions
What is the official rule for trading cards in Risk?
You may trade sets at the start of your turn, but must trade if you hold 5 or 6 cards.
Can I keep all my Risk cards until I am ready to attack?
No, if you have 5 or 6 cards at the start of your turn, you must trade in at least one set.
What happens if I have 6 cards and two different sets?
You must trade in at least one set, but you are permitted to trade in both sets if you wish.
Does the number of armies I get depend on my own sets?
No, the value increases based on the total number of sets traded in by all players.
David Noah is a board game rules specialist and content creator who writes clear, dispute‑free guides for modern tabletop games. On this site, he focuses on answering the exact rules questions players argue about at the table, using official rulebooks, expansions, and tournament rulings as his primary sources. His goal is to turn confusing edge cases into simple, step‑by‑step explanations so you can spend less time debating and more time playing.
