The Seattle Mariners won the 2026 season series against the Houston Astros, 10-3. The teams played 13 regular-season games, with Seattle winning 10 and Houston winning three.
Their final meeting was September 23, when the Mariners beat the Astros 6-5 in 10 innings at T-Mobile Park.
Key Takeaways:
- The Mariners went 10-3 against the Astros in 2026.
- Seattle won all four games of the opening April series.
- The Mariners also won three of four games in May.
- Seattle took two of three in Houston in August.
- The teams split their final two games in Seattle in September.
- Houston finished 81-81 and won the AL West, while Seattle finished 76-86 in third place.
Mariners vs Astros 2026 Head-to-Head Record
The Mariners vs Astros rivalry produced a surprisingly one-sided season series in 2026.
Seattle finished 10-3 against Houston, winning 76.9% of their meetings. The 13-game series included four games in April, four in May, three in August, and two in September.
The Mariners also scored substantially more runs across those meetings. Based on the individual game scores, Seattle scored 85 runs, while Houston scored 55.
| Category | Mariners | Astros |
| 2026 head-to-head record | 10-3 | 3-10 |
| Games played | 13 | 13 |
| Runs scored in series | 85 | 55 |
| Final 2026 record | 76-86 | 81-81 |
| AL West finish | 3rd | 1st |
The head-to-head results did not directly mirror the teams’ overall seasons. Houston won the AL West despite finishing exactly .500, while Seattle ended the regular season below .500.
Who Won the 2026 Mariners vs Astros Series?
The Seattle Mariners won the 2026 season series, 10 games to 3.
Seattle’s advantage was established early. The Mariners swept Houston in the first four-game series at T-Mobile Park in April, winning 9-6, 8-7, 6-1, and 6-2.
Seattle then won three of four games in Houston in May. The Astros’ only victory in that series came in a 4-3 extra-inning game on May 13. Seattle responded with an 8-3 win the following day. MLB noted after that victory that Seattle had won 10 of its previous 11 meetings with Houston at the time.
Mariners vs Astros: 2026 Scores and Results
Here are all 13 regular-season meetings between the teams:
| Date | Winner | Score |
| April 10 | Mariners | Seattle 9-6 |
| April 11 | Mariners | Seattle 8-7 |
| April 12 | Mariners | Seattle 6-1 |
| April 13 | Mariners | Seattle 6-2 |
| May 11 | Mariners | Seattle 3-1 |
| May 12 | Mariners | Seattle 10-2 |
| May 13 | Astros | Houston 4-3 |
| May 14 | Mariners | Seattle 8-3 |
| August 14 | Astros | Houston 10-7 |
| August 15 | Mariners | Seattle 10-5 |
| August 16 | Mariners | Seattle 3-2 |
| September 22 | Astros | Houston 7-0 |
| September 23 | Mariners | Seattle 6-5 |
The complete schedule confirms that the clubs met 13 times during the 2026 regular season.
How the 2026 Season Series Developed
April: Seattle Starts Fast
The first series immediately established the tone for the season matchup.
Seattle hosted Houston for four games from April 10 through April 13 and won every game. The Mariners outscored the Astros 29-16 during the four-game sweep.
That opening series gave Seattle an early 4-0 advantage in the season series.
May: Mariners Continue Their Edge
The teams met again in Houston from May 11 through May 14.
Seattle won the first two games, 3-1 and 10-2. Houston then took the third game 4-3 in 10 innings, but Seattle closed the series with an 8-3 victory.
The May series finished 3-1 in Seattle’s favor. MLB’s report on the finale described it as Seattle’s 10th win in its previous 11 meetings with Houston.
The May 14 game also featured home runs from Luke Raley and Mitch Garver for Seattle, while Yordan Alvarez homered for Houston.
August: Houston Gets a Win, Seattle Takes the Series
Houston finally won another game against Seattle on August 14, taking a 10-7 extra-inning decision.
Seattle answered immediately.
The Mariners won the next two games, 10-5 and 3-2, taking the three-game series 2-1. The August 16 finale was especially tight, with Seattle holding on for a one-run victory.
After that series, Seattle had already secured a commanding advantage in the season matchup.
September: Split in Seattle
The final two meetings came September 22 and 23 at T-Mobile Park.
Houston won the first game 7-0, with Yordan Alvarez hitting a home run and driving in three runs. The victory temporarily put Houston level with Texas at the top of the AL West.
Seattle answered the next night.
The Mariners defeated Houston 6-5 in 10 innings, ending the season series with a 10-3 advantage.
Mariners vs Astros: 2026 Team Context
Mariners’ 2026 Season
Seattle finished the regular season 76-86, third in the AL West and five games behind Houston. The Mariners ended the year with a 6-4 record over their final 10 games and won their final two games against the Los Angeles Angels.
Their strong record against Houston therefore stood out against their overall season record.
Seattle had also entered 2026 after a 90-72 season in 2025 and an ALCS appearance, but the club did not return to the postseason in 2026.
Astros’ 2026 Season
Houston finished 81-81, but that record was enough to win the AL West.
The Astros defeated the Athletics 9-0 on September 27 and secured the division after Texas lost to Minnesota. Houston finished one game ahead of Texas and earned another postseason appearance.
That created an unusual contrast: Seattle dominated Houston head-to-head, but Houston finished ahead of Seattle in the division and reached the postseason.
Mariners vs Astros All Time History
The two franchises have a long regular-season history as AL West opponents.
Through the end of the 2026 regular season, the Mariners’ overall regular-season record against Houston was 107-135, according to historical head-to-head data. In 2026 alone, Seattle went 10-3 against the Astros.
The recent direction of the matchup has also been notable. Seattle entered the 2026 season having won eight of the 13 meetings against Houston in 2025. The Mariners then continued that success by winning 10 of 13 in 2026.
Have the Mariners and Astros Met in the Playoffs?
Yes.
The Mariners and Astros have met once in the postseason. That meeting came in the 2022 American League Division Series.
Houston won the series in three games, including an extraordinary Game 1 comeback in which the Astros erased a large Seattle lead. The matchup remains the only postseason series between the two franchises through the end of the 2026 regular season.
Houston returned to the postseason in 2026 after winning the AL West, while Seattle missed the playoffs.
Mariners vs Astros FAQ
Who won the Mariners vs Astros season series in 2026?
The Seattle Mariners won the season series 10-3. Seattle won four of the first four games, three of four in May, two of three in August, and split the final two games in September.
What was the last Mariners vs Astros score?
The last meeting was September 23, 2026, at T-Mobile Park. The Mariners defeated the Astros 6-5 in 10 innings. Houston had won the previous night 7-0.
How many games did the Mariners win against the Astros in 2026?
Seattle won 10 of 13 regular-season meetings against Houston. The Astros won three games.
Are the Mariners and Astros in the same division?
Yes. Both teams compete in the American League West. The division also includes the Texas Rangers, Athletics, and Los Angeles Angels.
Have the Mariners and Astros played in the postseason?
Yes. Their only postseason matchup through the 2026 regular season was the 2022 AL Division Series, which Houston won in three games.
Conclusion
The Mariners vs Astros matchup produced a clear result in 2026: Seattle won the head-to-head season series 10-3 and outscored Houston 85-55 across the 13 meetings.
The larger season picture was different. Houston finished 81-81 and won the AL West, while Seattle finished 76-86 and missed the playoffs.
That contrast makes the 2026 series particularly interesting when looking at the two teams’ season results separately from their direct meetings.
I’m Maya Angelou, the creator behind EmojiAura.com, where I explore emoji meanings, social media trends, and fun digital expressions. I’m passionate about helping people understand the real meaning behind emojis and use them creatively in chats, captions, posts, and everyday online conversations.
