Dublin Marathon 2025 Route: Start, Map, Elevation & Cutoff

Running through Dublin on a crisp October morning is one of the best ways to see the city’s character unfold mile by mile. The 2025 Irish Life Dublin Marathon on October 26 follows a loop through historic streets, parks, and south-side suburbs that rewards runners who know what’s coming. This guide breaks down the start line, finish line, elevation profile, cutoff time, and the one climb that demands respect — so you can race smart, not just hard.

Route distance: 26.2 miles (42.2 km) ·
Date: October 26, 2025 ·
Start time: 8:40 AM (mass start) ·
Cutoff time: 5 hours 30 minutes (gun time) ·
Start line: Fitzwilliam Street Lower / Leeson Street, Dublin 2 ·
Finish line: Mount Street Crescent / Merrion Square, Dublin 2

The 2025 edition keeps the same core loop as previous years, but the details matter when you’re planning splits. Here is the full picture in one table:

Where is the start line for the Dublin Marathon 2025?

Start line exact address and access

The start line for the 2025 Dublin Marathon is on Fitzwilliam Street Lower and Leeson Street in Dublin 2, right in the heart of the city centre. According to Transport for Ireland (the government transport authority), the race begins in the south-central part of Dublin, a short walk from St. Stephen’s Green. Runners gather in designated start zones based on their predicted finish time, so arrive early to find your corral.

• Nearest landmarks: St. Stephen’s Green, Merrion Square, and the Royal College of Surgeons (Transport for Ireland)
• Public transport: Pearse Street and Tara Street DART stations are about a 15-minute walk away
• Bag drop: Located on nearby side streets, with signage from the start area

What time does the race begin?

The mass start is at 8:40 AM, with wheelchair athletes setting off five minutes earlier at 8:35 AM, per the St. Vincent’s University Hospital event advisory (official medical institution). The race uses a rolling start with multiple corrals, so your actual crossing time may be a minute or two after the gun. Plan to be in your corral by 8:15 AM at the latest.

The implication: the early start time helps you avoid peak afternoon heat, but means you need to plan your breakfast and warm-up around a tight window.

Where is the Dublin Marathon route?

Route overview and key landmarks

The Dublin Marathon is a single-loop course that starts in the south city centre, heads west through the Liberties, crosses the River Liffey into the north side, circles through Phoenix Park, then loops back through south Dublin suburbs to finish near Merrion Square. The route is described by Transport for Ireland as similar to previous years, with a downhill start from Leeson Street through St. Stephen’s Green.

• Miles 0-3: Downhill from Leeson Street through St. Stephen’s Green, then along Patrick Street past St. Patrick’s Cathedral (Transport for Ireland)
• Miles 3-5: First incline on Patrick Street heading toward Christchurch, then cross the River Liffey onto Dublin’s Northside (Transport for Ireland)
• Miles 5-8: First hydration station around Aughrim Street, then enter Phoenix Park around the 6K mark (Sport for Business)
• Miles 8-10: Through Phoenix Park past Dublin Zoo and Chesterfield Avenue; exit near Castleknock and re-enter at Knockmaroon Gate (Sport for Business)
• Miles 10-13.1: Descent toward Chapelizod and on to Inchicore; halfway point around Dolphin’s Barn and Crumlin Road after passing Kilmainham Gaol (Transport for Ireland)
• Miles 13.1-19: Flatter ground through Cromwellsfort and Fortfield Roads, downhill on Templeogue Road into Terenure (Transport for Ireland)
• Miles 19-22: The challenging section — uphill on the N11 toward UCD, then the famous Irish Heartbreak Hill around the 35K mark (Transport for Ireland)
• Miles 22-26.2: Downhill on Dartry Road, incline on Milltown Road, 3K climb along Clonskeagh and Roebuck Roads, then the final stretch to the finish (Transport for Ireland)

The course passes several landmarks worth noting if you have friends spectating. St. Patrick’s Cathedral, Christchurch, Kilmainham Gaol, Dublin Zoo, and the grand Chesterfield Avenue in Phoenix Park all sit along the route. For a self-guided tour of the city beyond race day, check out this guide to What to See in Dublin: Top Attractions, Itineraries & Local Tips.

The pattern: the course gives you a tour of Dublin’s iconic sites, but the landmarks also serve as pacing cues for when to conserve energy.

Elevation profile and hardest section

The Dublin Marathon is not a flat course, but it’s also not a mountain. Total elevation gain is approximately 320 feet (98 m), according to the official Transport for Ireland course description. The first half is net downhill, which sounds great — until you realize you’ll pay for it later.

• Net downhill first half: From the start at Leeson Street through St. Stephen’s Green and the Liberties, the course loses about 80 feet of elevation (Transport for Ireland)
• Gentle rise after mile 14: After Terenure, the course starts a gradual upward trend that builds into the main climb (Transport for Ireland)
• Mile 19-21 sustained climb: The N11 toward University College Dublin (Belfield) is the most demanding stretch — a steady grade that grinds down quads that have already done 18 miles (Transport for Ireland)
• Irish Heartbreak Hill at 35K: Around mile 21.7, this well-known feature of the Dublin course adds an extra sting just when you think the climbing is done (Sport for Business)

What is the cutoff time for the Dublin Marathon?

Mandatory cutoff at 5 hours 30 minutes

The official cutoff for the 2025 Dublin Marathon is 5 hours 30 minutes from the 8:40 AM gun time, as stated on the Irish Life Dublin Marathon official event website. That means if you cross the start line at 8:40 AM, you need to be across the finish line by 2:10 PM. The required minimum pace is 12 minutes and 36 seconds per mile — a brisk walking speed for most fit runners, but a real ask if you hit the wall at mile 20.

• Cutoff from gun time: 5 hours 30 minutes (Irish Life Dublin Marathon)
• Minimum pace: 12:36/mile (Irish Life Dublin Marathon)
• Net cutoff (from crossing start): Approximately 5 hours 28 minutes, accounting for the rolling start

Support point closure schedule

Water stations, medical tents, and on-course support close according to the same gun-time schedule. If you’re running near the cutoff, you’ll find that aid stations begin packing up as the clock ticks past 5 hours. The Transport for Ireland advisory notes that road re-openings also follow the gun-time cutoff, meaning slower runners will encounter traffic on sections of the course after the sweep vehicle passes.

The pattern: the cutoff forces you to run negative splits or at least even pacing, since any time lost early can’t be recovered on the climbs.

What is the hardest part of the Dublin Marathon?

Mile 19-21 climb through Belfield

The sustained gradient on the N11 toward University College Dublin (the Belfield campus) is widely considered the hardest section of the Dublin Marathon. The Transport for Ireland route description identifies a 3K climb along Clonskeagh and Roebuck Roads as part of the final 10K, and the N11 segment feeds directly into it. By mile 19, most runners have already burned through their glycogen reserves. Adding a sustained ascent at that point is a recipe for a dramatic pace drop.

• Location: N11 from Stillorgan toward UCD Belfield, continuing through Clonskeagh and Roebuck Roads (Transport for Ireland)
• Grade: Steady 2-3% gradient over roughly 2 miles, with steeper pitches on Roebuck Road (Transport for Ireland)
• Timing: Hits at mile 19, right when your legs are already questioning your life choices
• Irish Heartbreak Hill: Around the 35K mark (mile 21.7), a separate sharper rise that has earned its nickname (Sport for Business)

Flat sections and downhill start

The first half of the course is deceptively fast. From the start on Leeson Street through St. Stephen’s Green and the Liberties, the route loses elevation steadily. According to the Transport for Ireland course description, the third 10K segment (roughly miles 8-14) features flatter ground through Cromwellsfort and Fortfield Roads and a downhill on Templeogue Road into Terenure. The trap is hitting the halfway point feeling great and then discovering the second half has all the climbing.

• Miles 6-10 (Phoenix Park): Rolling terrain, mostly flat with a few gentle rises (Sport for Business)
• Miles 10-13.1 (Crumlin Road): Flat to gently rolling, net downhill toward the halfway point (Transport for Ireland)
• Miles 14-18 (Terenue to Churchtown): The flattest section of the entire course, ideal for maintaining steady splits (Transport for Ireland)

The pattern is clear: Dublin gives you a fast, forgiving first half and then asks a serious question at mile 19. The runners who respect that question finish strong. The ones who don’t, walk the last 5K.

Is 3 hours 10 minutes a good marathon time?

How 3:10 compares to average finisher times

A 3:10 marathon is an excellent time by any reasonable standard. The average finish time for the Dublin Marathon in 2024 was approximately 4 hours 12 minutes, according to official race results published by the Irish Life Dublin Marathon event page. That puts a 3:10 finish roughly 62 minutes faster than the median — a gap that represents about 15% of the total race duration.

• Average Dublin finisher (2024): ~4:12 (Irish Life Dublin Marathon)
• Top 15-20% threshold: Generally around 3:30-3:45 depending on field size
• 3:10 placement: Likely top 10-15% of the field, possibly higher in a competitive year
• Sub-3:00: Typically top 5-8% of marathon finishers

Age and gender benchmarks

The “good time” question depends on your age and gender as much as your raw number. For a male runner aged 40-44, a 3:10 is roughly equivalent to a 3:00 for a 25-year-old when adjusted by age-grading tables. For a female runner aged 35-39, 3:10 puts you in the top 5-8% of age-group finishers. The Irish Life Dublin Marathon official results from previous years show that sub-3:10 finishes typically fall well inside the top 20% across all categories.

• Sub-3:30: Above average for most age groups
• Sub-3:10: Excellent — competitive club runner territory
• Sub-3:00: Elite age-group performance
• Boston Qualifying (60+): 3:10 would qualify a male runner aged 60-64 by a 25-minute margin

The implication: If you’re targeting 3:10 at Dublin 2025, you’re not just “doing fine” — you’re running a time that puts you in a different category from the bulk of the field. The challenge is pacing the downhill first half conservatively enough to have the legs for that mile 19-21 climb.

What is the Dublin Marathon finish line location?

Finish line on Mount Street Crescent

The finish line for the 2025 Dublin Marathon is on Mount Street Crescent, near Merrion Square in Dublin 2. According to Transport for Ireland (the government transport authority), the finish area is located on Mount Street Upper, which runs into the crescent. The finish line is approximately 200 meters from the start line on Leeson Street, making the event unusually compact for a major city marathon — you can walk from the finish back to the start area in under 5 minutes.

• Address: Mount Street Crescent / Mount Street Upper, Dublin 2 (Transport for Ireland)
• Nearest landmark: Merrion Square Park (south side)
• Distance from start line: ~200 meters (a 3-minute walk)

Post-race area and family meeting point

The post-race area is set up in and around Merrion Square Park, with bag collection, food stands, and a designated family meeting point. The compact layout means you don’t have to stagger blocks in search of your gear. The Irish Life Dublin Marathon official site provides a post-race map closer to race day, but in previous years the setup has included:

• Bag collection in the park adjacent to the finish line
• Medical tent at the finish chute exit
• Family meeting point with alphabetized signs
• Refreshment stands within the park

The catch: The compact finish area means big crowds. If you have family meeting you, agree on a specific sign (not just “near the park”) because mobile networks get congested with thousands of people trying to find each other.

For runners comparing iconic city marathons, the London Marathon 2025 route offers a similarly flat and fast course through central London.

Frequently asked questions

Related reading

• Best Running Shoes for Men: Irish Buying Guide 2025 — Get the right footwear for race day
• What to See in Dublin: Top Attractions, Itineraries & Local Tips — Plan your post-marathon sightseeing