How to Sell Baseball Cards Before (and After) the 2026-27 MLB Season Ends

October is the hobby's biggest stage for baseball cards. November is a lot quieter. Here's how to make the most of the playoffs, and how to keep selling through a winter that might include a lockout.

Every baseball season ends the same way: One team in a dogpile, and 29 other fanbases saying "there’s always next year."

In Chicago, they've already said it twice. The Cubs were swept out of the Wild Card round by the San Diego Padres, and the White Sox's surprise postseason run ended in Game 5 of the ALDS by the Cleveland Guardians. (Credit where it's due, South Siders, that was both a lot of fun and an impressive turnaround considering the misery of the past few seasons.)

As of today, the Milwaukee Brewers lead the two-time defending champion Los Angeles Dodgers 3-0 (!) in the NLCS, because apparently payrolls mean nothing, and the Cleveland Guardians are locked in a 1-1 tie with the Tampa Bay Rays in the ALCS. The World Series starts Friday, October 23rd, and by early November, another season of Major League Baseball will be over. That's when things get quiet.

So, what can baseball card sellers do to prepare for the offseason, before the Winter Meetings in December, and before the Cactus League and Grapefruit League start just two months later?

The best way to handle the baseball offseason as a card seller is to sell into October's Postseason boom while it lasts, then use the winter to clean up inventory, restock smartly, and stay in front of buyers with the products—and storylines—that keep baseball in the news year-round.

Want more tips on how to sell your baseball cards? Don’t worry, Mascot, the all-in-one card-selling platform, has you covered.

Before the Last Out: Sell Into October

Playoff baseball puts the league’s biggest players on national TV almost every night, and buyers follow the action. During the 2025 postseason, Burbank Sportscards owner Rob Veres said that most of his Shohei Ohtani cards valued under $1,000 rose about 50%, as viewers clamored to get a piece of the player they watched each evening.

However, as great as Ohtani is, there are a plethora of names getting attention this October:

• William Contreras (Brewers): At 34, Contreras is still hitting game-tying homers and a go-ahead singles, helping the Brew Crew to victory in Game 2 of the NLCS—and tying a franchise record with five postseason homers (and counting).
• Jacob Misiorowski (Brewers): The league's ERA leader started Game 1 against the Dodgers. There’s a reason why he’s the NL’s Cy Young favorite.
• Freddy Peralta (Rays): The Rays pitcher went 4-0 with a 0.96 ERA in September to win AL Pitcher of the Month. In his first start against the Guardians, he went 6 innings, throwing 6 Ks without allowing a single run.
• José Ramírez and Nathaniel Lowe (Guardians): Ramírez led Cleveland past the White Sox in Game 5 of the ALDS, and Lowe's go-ahead single in the eighth inning won Game 1 of the ALCS. Cleveland hasn’t won a World Series since 1948…is this the year?
• Yoshinobu Yamamoto, Shohei Ohtani, and Mookie Betts (Dodgers): The Dodgers might be down, but they’re certainly not out—especially with the three biggest names remaining in the bracket. With a payroll this size, it’s no surprise they’re chasing a three-peat.

If you're holding these players' cards, the window between now and the final out is the strongest you'll see until spring. When a team is eliminated, attention on its players usually fades fast, so the time to sell is now.

After the Fireworks: What the Offseason Looks Like

The hot stove: Free agency gives baseball its winter headlines, and this class is led by Dodgers pitcher Tarik Skubal, whom CBS Sports calls the best starter on the market since Gerrit Cole in 2019. A big signing puts a player in a new uniform, and new uniforms bring new collectors into the mix. Will he stay, or will he go?

The lockout question: MLB's collective bargaining agreement expires at 11:59 p.m. ET on December 1st, and a lockout is widely expected. Two words: not good. During a lockout, trades and free-agent signings stop entirely, as hype grows to a halt. Players, fans, and owners all get frustrated, and the noise around the game turns bitter, rather than hopeful. The last one lasted 99 days, from December 2021 to March 2022, and fans, players, collectors, and sellers survived. However, it happens again, the winter's biggest baseball storylines could be on pause, so act accordingly.

The new cardboard: Topps doesn't take the winter off. Update Series Baseball arrives October 14th with All Kings and All Aces, Cosmic Chrome Baseball on November 4th (featuring Roman Anthony, Konnor Griffin, Kevin McGonigle, Munetaka Murakami, and JJ Wetherholt), and the high-end Museum Collection Baseball dropping on November 11th. New products keep prospect collectors busy, even when the ballparks aren't.

Your Offseason Playbook

1. Clear the backlog: The offseason is the best time to finally catalog the cards you didn't have time for in August. A baseball card scanner identifies the player, year, and set of a card from a photo, and Mascot's AI scanner offers unlimited scans on every plan, with flatbed support for scanning several cards at once. Nobody ever complained about time saved!

2. Let your prices move on their own: Demand slows in the winter, and stale listings can be a drag on your shop. Mascot's Pricing Rules help you set a start price, a floor, and a markdown schedule for each card, so that your less in-demand cards get more competitive every few weeks without dropping below your minimum threshold.

3. Restock while it's quiet: Even during this most recent card boom, there are typically less baseball card buyers in the offseason, giving you time to restock your inventory while there’s less competition from everyday buyers. Mascot's Card Hunter runs saved searches across 20+ marketplaces and auction houses, so you can set alerts for the cards you want and buy and snag them at a discount.

4. Turn commons into lots: If you've got boxes of base cards from this season, bundle them by team or player. We put together a handy guide to selling trading cards in bulk that talks you through the full process.

5. Follow the demand: Baseball slows down, but the NFL is in full swing, the NBA is right around the corner, and Pokémon doesn’t have an offseason. If your inventory covers more than one sport, the winter is a good time to lean on the others.

6. Stay listed everywhere: Winter buyers are scattered across eBay, Whatnot, TikTok Shop, and your own storefront. By using Mascot's Multi-channel listing tool, you can keep each card live on a wide variety of marketplaces, and watch as it automatically delists the moment it sells to avoid any painful refunds.

Wait 'Til Next Year

Pitchers and catchers report in February. Between now and then, there's a World Series champion to crown, a free agent class to sign (lockout permitting), and a stack of new Topps products to rip.

Whether your team is still competing or already out on the golf course, the offseason doesn't have to be a slow season for your card business. Sell into October, clean up in November, and be ready when spring training gives everyone a reason to believe again.