MLB Home Run Props Guide
HR props are high-variance but highly exploitable — park factor, wind direction, ISO, and pitcher HR/9 all create consistent edges for bettors who do the work. Here is how to identify the right spots.
What Are MLB Home Run Props?
Key Metrics for HR Props
ISO (Isolated Power)
ISO = SLG − AVG. The cleanest measure of raw power production. Elite power hitters (>.250 ISO) have meaningful HR probability in any game. Average hitters (.140–.180 ISO) need favourable conditions to be worth targeting at typical HR prop odds.
Hard-Hit Rate (EV ≥ 95 mph)
Balls hit at exit velocity ≥ 95 mph are the raw material for home runs. Hard-hit rate above 50% combined with a launch angle in the 25–35° range is the profile that generates above-average HR rates. ProprStats shows per-pitch-type hard-hit rate for every matchup.
Pitcher HR/9
Pitchers who allow home runs at an above-average rate (HR/9 > 1.3) are preferred targets for HR props. Combine with a power hitter and a HR-friendly park for the strongest edges.
Wind direction and speed
Wind blowing out toward centre field at 10+ mph meaningfully increases HR probability at outdoor parks. ProprStats pulls live wind data for every stadium and flags games where wind direction is significant. Dome stadiums are unaffected.
HR Park Factors — Key Stadiums
| Stadium | HR Factor | Rating |
|---|---|---|
| Coors Field | 1.25× | Extreme hitter |
| Great American Ball Park | 1.20× | Strong hitter |
| Yankee Stadium | 1.12× | Hitter-friendly |
| Rogers Centre | 1.08× | Hitter-friendly |
| American Family Field | 1.08× | Hitter-friendly |
| Chase Field | 1.10× | Hitter-friendly |
| Guaranteed Rate Field | 1.10× | Hitter-friendly |
| Citizens Bank Park | 1.10× | Hitter-friendly |
| Petco Park | 0.90× | Pitcher-friendly |
| loanDepot Park | 0.88× | Pitcher-friendly |
| Kauffman Stadium | 0.85× | Strong pitcher |
| Oracle Park | 0.85× | Strong pitcher |
HR factor >1.0 = more HRs than average; <1.0 = fewer. Source: ProprStats park factor database.
Frequently Asked Questions
What is an MLB home run prop?
An MLB home run prop is a bet on whether a batter will hit a home run in a specific game. The standard line is "Over 0.5 Home Runs" — you are betting the player homers at least once. Odds vary significantly based on the hitter's power profile, opposing pitcher's HR/9, the ballpark's HR factor, and wind conditions.
What is ISO and why does it matter for HR props?
ISO (Isolated Power) = Slugging Percentage − Batting Average. It measures a batter's raw extra-base hit power, independent of singles. Elite power hitters have an ISO above .250; average hitters are around .150. ISO is more predictive than home run count alone because it accounts for sample size and contact quality.
How does wind direction affect home run props?
Wind blowing out toward the outfield (roughly 225–315° at most parks) significantly increases HR probability. Wind blowing in from the outfield (45–135°) suppresses home runs. A 15+ mph wind blowing out can add meaningful edge to HR props at outdoor parks. ProprStats incorporates real-time wind data from the Open-Meteo API into every projection.
Which ballparks are best for home run props?
The most HR-friendly parks in MLB (by HR park factor) are Coors Field (1.25), Great American Ball Park (1.20), Yankee Stadium (1.12), Rogers Centre (1.08), and American Family Field (1.08). The most HR-suppressing parks are Oracle Park (0.85), Kauffman Stadium (0.85), and T-Mobile Park (0.90). Always check the park factor before betting HR props.
Find today's best HR prop spots
ProprStats combines ISO, hard-hit rate, park factor, and wind for every HR matchup daily.
Try ProprStats Free →Data sourced from the official MLB Stats API and Baseball Savant (Statcast). Analysis by the ProprStats Analytics Engine. Park factors calibrated from multi-year Statcast data. Statistics current as of the 2026 MLB season.