Races Half marathon · Portland, USA
Shamrock Run
Shamrock Run is a rolling half marathon in Portland, USA, held each March. A flat opening along the Willamette is followed by a long climb up Terwilliger Boulevard to a turnaround near mile 7. The return is mostly downhill with a gentle rise before the finish downtown. Mid-March in Portland is cool and often showery, typically 2 to 12°C. Portland's rolling course rewards effort-based pacing — hold steady effort on the rises and let the pace return on the descents.
Page rebuilt 2026-11-14 · race facts not independently verified — confirm dates and entries on the official race site
When
March
next: Sunday 14 March 2027
Course
rolling
Half marathon
Conditions
Mid-March in Portland is cool and often showery, typically 2 to 12°C.
Racing this course well
A flat opening along the Willamette is followed by a long climb up Terwilliger Boulevard to a turnaround near mile 7. The return is mostly downhill with a gentle rise before the finish downtown.
Portland's rolling course rewards effort-based pacing — hold steady effort on the rises and let the pace return on the descents.
Getting a place
- How you get in
- Open entry: first come, first served
- Price
- $95 at the time of checking, reduced from $136 (2027 race)
Official Shamrock Run site →Checked November 2026
Race day
- Next race
- Sunday 14 March 2027
- Also on the day
- 8k, 5k
The course in numbers
The hardest stretch is the short, steep climb on Terwilliger just before mile 8. A gradual climb back up Terwilliger follows from about mile 10.
- Layout
- Out-and-back
- Surface
- Paved city roads
Worth knowing
- The race describes itself as Portland's longest running tradition.
Pick your goal for Portland
Pace charts, weekly structure and timelines for the most common half marathon goals:
The date shown is the one the organiser has announced. Change it if yours differs.
Build your training around Shamrock Run.
RunV works backwards from race day to today. Your plan adapts when life interrupts, and you approve every change. It does not adapt to this specific course — the pacing guidance above is where the course knowledge is.
Everything above stays free and complete — this is an optional next step, not a paywall.
Asked often
- When is the Shamrock Run?
- The next Shamrock Run is on Sunday 14 March 2027 in Portland, USA. It is held each March.
- Is the Shamrock Run course flat?
- A flat opening along the Willamette is followed by a long climb up Terwilliger Boulevard to a turnaround near mile 7. The return is mostly downhill with a gentle rise before the finish downtown.
- How do I enter the Shamrock Run?
- Open entry: first come, first served. Price: $95 at the time of checking, reduced from $136 (2027 race).
- How should I train for the Shamrock Run?
- Match your preparation to Shamrock Run's profile and the March weather, then protect consistency — with RunV Premium you can adapt your plan to fit your week, so one bad week never derails the block.
Not sure what to target? Predict your half marathon time from a recent race →
More half marathon races
Supplements research for this distance
Build for Portland — around your actual life
RunV engineers your block backwards from race day in March — and adapts it when training doesn't go to script. You approve every change.
