Mekong Half Marathon 2026 Review | Vientiane Laos Race

Name: Mekong Half Marathon 2026 Review | Vientiane Laos Race
Item: Mekong Half Marathon
Author: Run SEA

Mekong Half Marathon

The Mekong Half Marathon is a 21.1km race held in Vientiane, Laos.

Compiled by the Run SEA editorial team from the sources cited below — not a first-hand race report. How we research listings.

Facts last checked July 23, 2026

The Mekong Half Marathon is a road running event scheduled for September 27, 2026, in Vientiane, Laos. Organized by Green Step, it takes place at the Xaysetha Economic Zone and offers three distance options: 21.1km, 10km, and 5km.

The bottom line

The Mekong Half Marathon is a Vientiane road race organised by Green Step, a Lao social enterprise, at the Xaysetha Economic Zone along the Mekong River roughly 10 km from central Vientiane. Three distances (21K, 10K, 5K) with registration open through RunLaos.com. September is the tail of the rainy season: warm, humid, with the Mekong at its peak. The race online footprint is thin beyond Green Step social media, consistent with Laos emerging running market. For runners wanting a Lao half marathon with the Mekong River setting and social-enterprise character, this is a solid, bookable pick for 27 September 2026.

Key facts
Date	2026-09-27
Distance Km	21, 10, 5
Primary Distance Km	21.1
Organizer	Green Step
Venue	Xaysetha Economic Zone, Vientiane
City	Vientiane
Country	Laos

Vientiane and the Mekong

Vientiane is one of Southeast Asia most understated capitals, a low-rise city on the Mekong River with the Thai border visible across the water. The Xaysetha Economic Zone sits roughly 10 km southeast of the city centre along the Mekong, providing riverside roads and event infrastructure. The Mekong River rather than the venue architecture is the visual centrepiece of the race ^[1]^[2].

Green Step: A Social Enterprise

Green Step is a Lao social enterprise whose work spans environmental advocacy, community health, and sports-event organisation. The Mekong Half Marathon promotes active lifestyles in Laos while channelling resources toward Mekong causes. Expect a community-scale production rather than commercial polish ^[1].

The Course

The course runs through Xaysetha Economic Zone on flat roads parallel to the Mekong. Vientiane sits on the Mekong floodplain with negligible elevation gain, making this a PB-friendly profile. The Mekong in September is wide and powerful, with views across to the Thai bank giving the course an international-border quality unique among Southeast Asian road races ^[1]^[2].

September Climate

September is the tail end of the Lao rainy season: 27-33C with humidity above 80 percent. Rain is a live possibility with 15-20 rainy days in September, though rain typically arrives as afternoon thunderstorms. The Mekong is at its annual peak, swollen with monsoon runoff. Train in hot conditions and hydrate at every station ^[3].

Registration and Logistics

Wattay International Airport (VTE) serves Vientiane with direct flights from Bangkok, Hanoi, and KL. The Xaysetha Economic Zone is a 20-minute tuk-tuk ride from the city centre. Confirm kit-collection details directly with Green Step before travelling ^[1].

Should You Run It?

If you want a Mekong riverside half marathon. Accept the thin pre-race information and rainy-season risk, and register through RunLaos.com while the window remains open ^[1].

References & sources

1. Mekong Half Marathon Green Step event page — Green Step / RunLaos.com
2. Vientiane Wikipedia entry — Wikipedia
3. Climate of Laos Wikipedia entry — Wikipedia

Quotes are short excerpts reproduced under fair use and attributed to their original authors; follow the links above for the full context. This article is an independent summary and is not affiliated with the event.

Pros

Multiple distance options (21.1km, 10km, 5km) suit a range of runner abilities
Organized event with a defined venue at Xaysetha Economic Zone, Vientiane

half-marathon laos

Find out more about Mekong Half Marathon

Frequently asked questions

When is the Mekong Half Marathon taking place?

The Mekong Half Marathon is scheduled to take place on September 27, 2026. It is organized by Green Step and held in Vientiane, Laos. Runners interested in participating should note that registration for this event is currently open, so early planning is recommended.

What distances can I run at the Mekong Half Marathon?

The Mekong Half Marathon offers three distance options for participants to choose from: 21.1km, 10km, and 5km. The primary distance for the event is the 21.1km half marathon, though runners can select the shorter 10km or 5km distances if preferred.

Where is the Mekong Half Marathon held?

The Mekong Half Marathon is held at the Xaysetha Economic Zone in Vientiane, Laos. This venue serves as the location for the race, which is organized by Green Step and includes distance options of 21.1km, 10km, and 5km for participants.

What is the course like?

Flat riverside course through Xaysetha Economic Zone on roads parallel to the Mekong River. Negligible elevation gain on the Mekong floodplain. The Mekong in September is wide and powerful with views across to the Thai bank.

Who is Green Step?

Green Step is a Lao social enterprise working in environmental advocacy and community health. The Mekong Half Marathon is part of their mission. Expect a community-scale production rather than commercial polish.

What is the weather in September?

September is the tail of the Lao rainy season: 27-33C, humidity above 80 percent, and 15-20 rainy days. Rain typically arrives as afternoon thunderstorms, favouring a morning start. The Mekong is at its annual peak.

How do I register?

Fly to Wattay International Airport (VTE). The Xaysetha Economic Zone is a 20-minute tuk-tuk ride from central Vientiane. Confirm kit-collection details directly with Green Step.