The word Bonus can suggest that the extra number is the final obstacle between your main selections and the jackpot. In Montana Big Sky Bonus, that assumption would lead you in the wrong direction. Matching the four main numbers qualifies for the jackpot category; the separately selected Bonus number supplies an additional prize rather than unlocking the jackpot itself.
That distinction also explains why the official page shows both a main-match table and a combined table. One describes events without excluding a simultaneous bonus match, while the other separates outcomes more narrowly. Different odds beside a similar-looking label are not necessarily a contradiction, but you need to know which question the table is answering.
Four main selections and one separate Bonus number
A $2 play asks for four different main numbers from 1 through 31 and a Bonus number from 1 through 16. A line such as main 4, 13, 22, 31 with Bonus 13 is valid: the repeated value belongs to two separate pools.
Within the four main selections, you still need distinct values. A tool that repeats 13 twice among those four would not produce the intended combination. A tool that prevents the Bonus from equaling any main value would be unnecessarily restrictive in the other direction.
Our Montana number selector keeps the two pools separate. Copy the labels along with the values, because a familiar number in the wrong pool does not satisfy the matching task you were hoping for.
Check the main line without waiting for the Bonus result
Imagine your ticket has main numbers 4, 13, 22, 31 and Bonus 13. If the official main set is 4, 13, 22, 31, your four main selections match regardless of which Bonus value is drawn. Missing that Bonus does not erase the four-match result.
If the drawn Bonus is also 13, the published combined category is the jackpot plus $10. That is different from a game where all main selections without a bonus earn a much smaller second prize. Do not import that familiar structure just because the ticket has two sections.
For a useful contrast, Maine Tri-State Megabucks does require its Megaball as part of the jackpot combination. Separate pools can look alike on paper while assigning the second pool very different jobs.
The $10 Bonus can stand on its own
The Bonus match has its own listed $10 payment. It can accompany main-line prizes, including the published $20 three-main-match category or the $2 two-main-match category. The combined table makes those additions explicit.
For example, suppose your line matches three main numbers and the Bonus. The worked total is $20 plus $10, or $30. If the same three main matches occur without the Bonus, the main category remains $20. The extra value supplements the main result rather than changing how many main numbers matched.
A Bonus match can also produce the $10 outcome when the main line has no qualifying prize. Count the two parts separately, then combine the applicable payments. Counting a drawn main 13 as though it were the Bonus 13 would break that process, even though the printed values happen to look identical.
Why one table says 31,465 and another says 33,563
There are 31,465 ways to choose four different numbers from 31. A fixed main line therefore matches all four with probability one in 31,465, without imposing any condition on the Bonus result.
If you ask specifically for four main matches and a missed Bonus, you have narrowed the event. The Bonus must land on one of the fifteen other values out of sixteen. That narrower event is approximately one in 33,563, matching the rounded combined-table figure.
Four main matches together with the matching Bonus form a different narrow event: one in 31,465 multiplied by one in 16, or one in 503,440. The main jackpot category covers both of those possibilities, because the Bonus is not required to qualify through four main matches.
This is why reading the table heading and qualifiers matters. The larger denominator beside the more specific outcome does not mean your main numbers somehow became less likely after the Bonus was drawn.
A progressive amount is attached to a particular drawing
Big Sky Bonus has a progressive jackpot, so do not treat an amount shown in an older result as a permanent top-prize figure. Check the current operator information for the drawing and its payment conditions before assigning a dollar value to a potential jackpot match.
The lower-category examples above explain the published matching structure; official validation remains the way to settle an actual ticket. Keep the original intact and avoid posting its identifying details while asking somebody else to help read it.
A number-frequency list cannot settle the payment or predict the next result. It describes what has happened, whereas the ticket needs the official result for the drawing it actually entered.
Finish the check in two columns
Write down the number of main matches and whether the Bonus matched. Use the first fact to locate the main category, then the second to identify the additional payment. That simple two-column habit prevents the game's name from persuading you that a missed Bonus ruined a jackpot line.
The Montana directory also lists Montana Cash, which uses a different selection format. Multi-draw purchases repeat the relevant entry across dates, so perform the two-part check again for each applicable result. A clear record of the drawing and the two match counts is more useful than a ticket covered in unlabeled circles.
Official sources
Rules checked 2026-10-19. Use the operator for current prizes, deadlines and ticket validation.