August 2026 Running Guide: Ireland's Best Races, Training Tips & Autumn Marathon Prep

August is the pivot month of the Irish running year. Summer racing peaks, autumn marathon training gets serious, and the choices you make over the next five weeks will decide how October feels. Here's your complete guide — the full August race calendar, the training milestones that matter, and how to arrive at your goal race healthy.

The August Race Calendar

Marathons

• Celtic Warrior Marathon — Lough Ennell, Co. Westmeath (August 1). Lakeside scenery and a warm midlands welcome.
• Quadrathon Challenge Full Marathon — Donegal (August 13). For those who like their miles wild and northern.
• Ballycastle to Waterfoot Trail Marathon — Co. Antrim (August 22). Point-to-point along one of the most spectacular coastlines in Europe.
• Kilkenny Marathon — Kilkenny City (August 29).
• Longford Marathon weekend — August 30. The Abbott Longford Marathon starts on Main Street, Longford Town — famously flat, famously friendly, and a brilliant final long-run-with-a-medal for Dublin-bound runners.

Half Marathons

• Athy Half Marathon — Athy Town Centre, Co. Kildare (August 9)
• Youghal Bay Half Marathon — Youghal, Co. Cork (August 9)
• Newcastle Half Marathon — Co. Down (August 16), in the shadow of the Mournes
• Antrim Coast Half Marathon — Larne to Cushendall (August 23). One of the fastest half marathon courses on the island — PB territory.
• Tullamore Harriers Half Marathon — Co. Offaly (August 29), a midlands classic
• Donegal Half Marathon — Letterkenny (August 30)

The Greenway & Shorter Stuff

• South East Greenway 5K Stride — Co. Wexford (August 7). Flat, fast, family-friendly greenway running at its best.
• Turf Warrior Obstacle Race & Mud Run — Co. Galway (August 8), for those who like their 8Ks muddy.

The Very Pink Run Series

Ireland's favourite charity run series returns in force: the Very Pink 10K Challenge (Dublin, August 28), Very Pink Run Dublin 5K & 10K (August 29), and Very Pink Run Kilkenny 5K & 10K (August 30) — with Cork following in early September. Brilliant atmosphere, brilliant cause.

The Warriors Run — August 22

A special mention for one of Ireland's most iconic races. The Warriors Run in Strandhill, Co. Sligo, sends runners from the beach to the summit of Knocknarea — Queen Maeve's cairn — and back. Forty-plus years of history, savage climbing, and the best post-race atmosphere in the West.

Autumn Marathon Prep: The Three Milestones

If you're racing Dublin, Dingle, Kilkenny or any October marathon, August is where the work happens. Three milestones matter:

1. Peak Volume (Mid-August to Mid-September)

Your biggest weeks land here. Build to your highest sustainable mileage — the operative word being sustainable. Peak volume that leaves you limping isn't fitness, it's a countdown to injury. Cutback weeks every third or fourth week are non-negotiable.

2. The 20-Miler (Early-to-Mid September)

The classic 32km confidence builder. You need one or two, no more. Run them easy with a marathon-pace finish, practise your exact race-day fuelling (gels every 25–30 minutes, 30–60g carbs per hour), and treat the recovery afterwards with the same respect as the run itself. Racing the Longford Marathon as a training run? Plenty do — just have the discipline to hold back.

3. The Taper (Final 2–3 Weeks)

Volume drops 30–50%, intensity stays. The taper is where fitness is absorbed, not built. Expect phantom niggles and grumpiness — both are normal, neither means you're losing fitness.

Staying Injury-Free When It Matters Most

August is peak physio season, because August is peak "too much, too soon" season.

• Keep the strength work. Two 20-minute sessions a week — single-leg calf raises, glute bridges, single-leg deadlifts. This is your insurance policy.
• Respect the 10% rule even during peak build.
• Sharp, localised pain that changes your gait = stop and get it assessed. Three days of rest in August is nothing. Three weeks of forced rest in October is everything.
• Sleep is your best recovery tool. 7–9 hours, especially after long runs.

The Mindset Month

A final word on the mental game. August long runs are where doubt shows up — 28km alone on a drizzly Sunday will ask you questions. Good. That's the training. The confidence you'll draw on at mile 22 in October isn't built on race day; it's built on the August mornings you showed up anyway.

Set process goals (complete the week, hit the long run), not just outcome goals (the finish time). Process is in your control. Outcomes follow.

Find Your August Race

From greenway 5Ks to coastal marathons, August has a start line for every runner in every corner of Ireland. Browse the full calendar of races across all 32 counties on enduroeire.ie — and we'll see you out there.