Shape of the Park
The shortest corner is 326 feet and the deepest listed alley is 401 feet. The dimensions do not create an automatic edge by themselves, so hitter type and pitcher shape should drive the read.
BALLPARK PROFILE 2026
T-Mobile Park Park Factors 2026
Seattle Mariners - Seattle, WA
T-Mobile Park plays as a controlled-environment park for 2026. Its run factor is 0.95 (-5% vs league average) and its home run factor is 0.92 (-8%).
Quick answer
Is T-Mobile Park hitter-friendly?
T-Mobile Park has a 0.95 run factor, 0.92 home run factor, and 0.96 hits factor. Values above 1.00 favor hitters; values below 1.00 favor pitchers.
Park-factor read
How T-Mobile Park Changes the Bet
T-Mobile Park usually asks hitters to earn it. T-Mobile Park is the Seattle Mariners home park in Seattle, WA. For betting, the useful question is not whether the park is "good for hitters." It is which markets the venue changes most: home runs, run scoring, hits, or weather-sensitive totals.
Scoring Profile
A 0.92 home run factor keeps raw power in check. Overs on home run props need a stronger hitter or pitcher case than usual. The 0.95 run factor leans pitcher-friendly. Unders and NRFI angles still need price discipline, but the venue is not fighting them.
Weather Check
T-Mobile Park has a retractable roof. The roof decision matters because it can turn a weather-sensitive slate into a much more controlled environment.
Sources for basic venue facts: Wikidata, Wikipedia, Official venue/team site. The park-factor read above is original thecapper.io analysis.
Opened
2000
Capacity
47,943
Roof
Retractable
Altitude
35 ft
Historical Venue Outcomes Artifact
471 graded model rows mapped to this home venue across official and research ledgers.
25%
model row win rate
History and naming
T-Mobile Park Venue History
T-Mobile Park opened in 2000 and serves as the home venue for the Seattle Mariners. That matters for searchers and bettors because venue names, naming-rights language, and team shorthand often get mixed together in MLB research. This profile uses the current venue identity, then connects it to the team, city, roof type, dimensions, and betting factors that actually affect the game. At 47,943 listed capacity with grass playing surface, T-Mobile Park is a modern-era MLB venue with enough history for park factors to stabilize. The page cites Wikidata, Wikipedia, Official venue/team site for basic identity facts, but the park-factor interpretation is original analysis from thecapper.io.
Naming Note
Use T-Mobile Park, Seattle Mariners, and Seattle, WA together when comparing park-factor research. Fans may search by team, city, nickname, sponsor name, or older venue wording, but the betting question is the same: which run environment is attached to today's home team? This page keeps the current official venue name tied to the Seattle Mariners profile so related pages, game previews, tools, and model explanations can point to one canonical ballpark URL.
Seasonal environment
How Weather Changes T-Mobile Park
T-Mobile Park has a retractable roof, which makes roof status part of the handicap. When the roof is closed, the park behaves more like a controlled environment. When it is open, temperature, humidity, and wind can change how fly balls carry and how totals should be framed. Early-season games can play differently from midsummer games even when the listed park factor is unchanged.
Spring Read
Early-season games can be the most misleading because the listed park factor is season-neutral while temperature, wind, and lineup timing are not. Be careful with overs, home run props, and small-sample venue trends when the weather is cold.
Summer Read
Warmer air generally helps carry and can make hitter-friendly parks more dangerous. In pitcher-friendly parks, summer weather can narrow the gap between the static factor and the live betting environment.
Late-Season Read
September baseball can bring cooler nights, different shadows, bullpen fatigue, and lineup churn. That makes the park profile useful, but it should be paired with current team context and confirmed lineups.
Venue trends
Recent Run Environment at T-Mobile Park
A static park factor tells you the baseline. Recent results show how the park has actually played this season: totals, team scoring, first-inning scoring, and tracked pitcher strikeout props.
10 recent games in focus
Last 5
8.2
avg runs/game
O/U3-2
YRFI80%
Home runs3.8
Away runs4.4
K props2
Last 10
8
avg runs/game
O/U5-4-1
YRFI90%
Home runs3.7
Away runs4.3
K props4.5
Last 20
8.3
avg runs/game
O/U5-4-1
YRFI78.9%
Home runs4.5
Away runs3.9
K props5.4
Last 30
8.4
avg runs/game
O/U5-4-1
YRFI78.9%
Home runs4.4
Away runs4
K props5.4
Season
8.4
avg runs/game
O/U5-4-1
YRFI78.9%
Home runs4.4
Away runs4
K props5.4
How to Use These Trends
Use the windows as a sanity check, not a pick generator. If the last 5 and last 10 are running hot but the season line is neutral, ask whether weather, opponent quality, or bullpen chaos created the spike. If every window points the same way, the venue signal is more interesting.
Recent Games at T-Mobile Park
| Date | Matchup | Runs | Line | O/U |
|---|---|---|---|---|
| 2026-05-04 | Atlanta Braves @ Seattle Mariners | 9 | 7.5 | OVER |
| 2026-05-03 | Kansas City Royals @ Seattle Mariners | 5 | 8 | UNDER |
| 2026-05-02 | Kansas City Royals @ Seattle Mariners | 5 | 7.5 | UNDER |
| 2026-05-01 | Kansas City Royals @ Seattle Mariners | 13 | 7 | OVER |
| 2026-04-22 | Athletics @ Seattle Mariners | 9 | 7.5 | OVER |
Run trends use final MLB game scores by home venue. O/U trend uses available sportsbook total lines from game-market shadow rows. NRFI and K trend use graded pick outcome ledgers, so sample sizes vary by park.
T-Mobile Park Park Factor Rankings
Run Factor
0.95
No. 26 of 30
-5% vs league average for run scoring. Pitcher-friendly lean.
Home Run Factor
0.92
No. 26 of 30
-8% vs league average for home runs. Pitcher-friendly lean.
Hits Factor
0.96
No. 25 of 30
-4% vs league average for hit frequency. Pitcher-friendly lean.
Field Dimensions
Distances in feet from home plate. Shorter corners can amplify pull-side power, while deeper alleys can turn fly balls into extra-base volatility.
LF
330
CF
401
RF
326
Left-Center
375
Right-Center
377
Betting Impact
Run scoring is suppressed by 5%, giving pitchers, unders, and NRFI looks a structural venue boost. The 0.92 HR factor suppresses home runs, so raw power props need a stronger matchup case. Roof control can reduce weather variance compared with open-air parks. Pitcher-friendly. Cool air suppresses HRs. Below-average for runs and power. Retractable roof helps with weather variance. Wind can be unpredictable.
Use with caution
Park factors are context, not picks. The best reads combine venue, weather, lineup quality, starting pitchers, bullpen form, and current market price.
Quirks explained
T-Mobile Park Quirks and Notable Features
Ballpark quirks are only useful when they are translated into baseball outcomes. The notes below explain what each feature can change: pull-side power, doubles and triples, hit probability, totals, or weather sensitivity.
Cool maritime climate
Cool, marine-influenced air can knock down carry, especially at night. That is most important for home run props and overs: a ball that leaves in warm inland air may die at the track in this environment.
Lower wall in right field
A distinctive outfield wall changes more than home run distance. Caroms, wall height, and outfielder familiarity can affect doubles, triples, and total bases when hitters drive the ball to that part of the park.
Retractable roof
Roof status changes how much weather belongs in the handicap. Closed-roof games make the park play closer to its baseline factor; open-roof games bring temperature, wind, and humidity back into totals and prop decisions.
Puget Sound wind patterns
Cool, marine-influenced air can knock down carry, especially at night. That is most important for home run props and overs: a ball that leaves in warm inland air may die at the track in this environment.
Source-backed venue facts
Sources and External References
We use reputable external references for basic venue identity facts only. The park-factor rankings, betting context, and model notes on this page are original thecapper.io analysis and do not copy prose from Wikipedia or official venue pages.
- Wikidata entity
- Q1193117
- Architect
- NBBJ
- Operator
- Seattle Mariners
- Coordinates
- 47.591389, -122.3325
FAQ
Is T-Mobile Park hitter-friendly in 2026?
T-Mobile Park has a 0.95 run factor and a 0.92 home run factor, making it a controlled-environment park for betting context.
What is the home run factor at T-Mobile Park?
T-Mobile Park has a 0.92 home run factor, which is -8% compared with a league-average 1.00 baseline.
How should bettors use T-Mobile Park park factors?
Use the venue factor as context, not a standalone pick. Combine it with lineups, starting pitchers, bullpen form, weather, and market price before betting totals or player props.
Does weather change how T-Mobile Park plays?
T-Mobile Park has a retractable roof, which makes roof status part of the handicap. When the roof is closed, the park behaves more like a controlled environment. When it is open, temperature, humidity, and wind can change how fly balls carry and how totals should be framed. Early-season games can play differently from midsummer games even when the listed park factor is unchanged.
What makes T-Mobile Park unique?
T-Mobile Park's notable features include Cool maritime climate, Lower wall in right field, Retractable roof, Puget Sound wind patterns. Those quirks matter because dimensions, wall shape, roof state, and air conditions can change batted-ball outcomes by market.