Compiled and fact-checked by Tommo, Verus founder · Last verified August 2026 · Spot an error?
Running · Half Marathons
ATW Welwyn Half Marathon 2026
- Race day
- Sunday, 4 October 2026
- Location
- Welwyn Garden City, Hertfordshire, UK
- Distance
- 13.1 mi / 21.1 km
ATW Welwyn Half Marathon: 4 October 2026, from Gosling Sports Park, Welwyn Garden City. Entry, route, a pace chart and the race-day forecast.
ATW Welwyn Half Marathon Race Timeline
24 days to go
This is where the real training happens — building your long run and getting comfortable with half-marathon race-pace.
ATW Welwyn Half Marathon 2026: quick answers
When is ATW Welwyn Half Marathon 2026?
ATW Welwyn Half Marathon 2026 takes place on Sunday, 4 October 2026.
Where does ATW Welwyn Half Marathon start and finish?
ATW Welwyn Half Marathon starts at Gosling Sports Park, Welwyn Garden City and finishes at Gosling Sports Park, Welwyn Garden City.
How many miles is ATW Welwyn Half Marathon?
ATW Welwyn Half Marathon is 13.1 miles (21.1km).
How much does ATW Welwyn Half Marathon cost to enter?
Entry direct through Active Training World — check the official site for current pricing.
Key Race Metrics & Overview
- Date
- Sunday, 4 October 2026
- Distance
- 13.1 miles / 21.1km
- Location
- Welwyn Garden City, Hertfordshire, UK
- Start Point
- Gosling Sports Park, Welwyn Garden City
- Finish Point
- Gosling Sports Park, Welwyn Garden City
- Surface
- Athletics track, tarmac and traffic-free railway path
Not published by the organiser at the time of writing: start time, cut-off time, age requirement, tracking app. Verus records these as unconfirmed rather than estimating them — check the official race website closer to race day.
Direct Entry Summary
Entry direct through Active Training World — check the official site for current pricing.
Ballot Policy
No ballot — entry is direct through Active Training World.
ATW Welwyn Half Marathon Race Day Weather
A real forecast appears here once one exists for race day — usually about a week to ten days out. Nothing is shown until then, because a made-up forecast is worse than none.
ATW Welwyn Half Marathon Route Map & Elevation Profile
Starting at Gosling Sports Park, Welwyn Garden City and finishing at Gosling Sports Park, Welwyn Garden City. Total elevation gain is not published for this event, and Verus does not estimate one.
Is ATW Welwyn Half Marathon flat?
No official elevation figure is published for this course, so Verus doesn't state one. The organiser describes the going as: athletics track, tarmac and traffic-free railway path.
ATW Welwyn Half Marathon Course Profile
Elevation change not published for this event.
Tap a point on the course for details.
Gosling Sports Park, Welwyn Garden City
Start line.
Where ATW Welwyn Half Marathon starts and finishes
ATW Welwyn Half Marathon starts at Gosling Sports Park, Welwyn Garden City and finishes at Gosling Sports Park, Welwyn Garden City. We haven't been able to place those on a map accurately enough to show one — a pin in the wrong place is worse than no pin.
These are the start and finish points, not the route. Verus doesn't hold course files for this race, and drawing a line between two pins would be a guess you might end up training on.
Full ATW Welwyn Half Marathon Route Breakdown
Starts and finishes on the 400m track at Gosling Sports Park, with most of the route on the traffic-free Cole Green Way. A 10K runs alongside it on the same morning.
ATW Welwyn Half Marathon Pace Calculator & Splits
ATW Welwyn Half Marathon Pace Calculator
Enter a target finish time to see your pace and projected splits.
Average pace / mile
18:19
Average pace / km
11:23
ATW Welwyn Half Marathon Pace Chart
Split markers calculated for standard checkpoints — no official pacers are confirmed for this event.
| Target | Pace /mi | Pace /km | 5K | 10K | Finish |
|---|---|---|---|---|---|
| 3:00 | 13:44 | 8:32 | 42:41 | 1:25:23 | 3:00:00 |
| 3:15 | 14:53 | 9:15 | 46:15 | 1:32:30 | 3:15:00 |
| 3:30 | 16:02 | 9:58 | 49:48 | 1:39:37 | 3:30:00 |
| 3:45 | 17:11 | 10:40 | 53:22 | 1:46:43 | 3:45:00 |
| 4:00 | 18:19 | 11:23 | 56:55 | 1:53:50 | 4:00:00 |
| 4:15 | 19:28 | 12:06 | 1:00:29 | 2:00:57 | 4:15:00 |
| 4:30 | 20:37 | 12:48 | 1:04:02 | 2:08:04 | 4:30:00 |
| 4:45 | 21:45 | 13:31 | 1:07:36 | 2:15:11 | 4:45:00 |
| 5:00 | 22:54 | 14:14 | 1:11:09 | 2:22:18 | 5:00:00 |
| 5:30 | 25:11 | 15:39 | 1:18:16 | 2:36:32 | 5:30:00 |
| 6:00 | 27:29 | 17:05 | 1:25:23 | 2:50:46 | 6:00:00 |
| 6:30 | 29:46 | 18:30 | 1:32:30 | 3:04:59 | 6:30:00 |
| 7:00 | 32:04 | 19:55 | 1:39:37 | 3:19:13 | 7:00:00 |
ATW Welwyn Half Marathon Finish Time Estimator
Enter a recent 5K, 10K or Half Marathon time to estimate your ATW Welwyn Half Marathon finish time.
Your 5K time
Estimated ATW Welwyn Half Marathon finish
1:54:55
An estimate only, based on Pete Riegel's race-time prediction formula. Real marathon performance depends on endurance, training specificity, pacing and race-day conditions — not just your speed over a shorter distance.
Training for a different distance? Try the full pace calculator, race time predictor or pace chart.
Got your target time? Save it to your profile.
Tag ATW Welwyn Half Marathon, set your goal pace, and let Verus track your countdown, training and fundraising in one place.
Start Your Verus JourneyATW Welwyn Half Marathon Race Day Checklist
Tap items to mark off your race-day readiness.
- Race number attached, and any timing chip fitted per your race pack instructions
- Weather-appropriate kit, plus something warm and disposable to discard before the start
- A plan for reaching Gosling Sports Park, Welwyn Garden City
- A meeting point agreed with family and friends for after the race
Training Strategy for ATW Welwyn Half Marathon
10-14 weeks is a solid window for a first half marathon; 8-10 weeks is enough if you're already maintaining a baseline mileage. Build your long run up gradually rather than jumping straight to race distance.
This is a largely flat course, so most of your long runs can mirror that — flat and steady, building time on feet rather than hill strength.
Reduce overall mileage across the final 7-10 days while preserving short race-pace bursts. Arrive at Gosling Sports Park, Welwyn Garden City fresh, energized, and primed — not fit, fresh.
Lock in your target pace using the interactive splits calculator below — no official pacers are confirmed for this event, so a pace band on your watch is the more reliable option.
Test your race-day fuel and hydration plan on your long training runs, not for the first time on race day — check the Race Day Checklist below for what's actually on this course.
Half Marathon Nutrition & Fueling Plan
A normal diet is fine. There is no need to carb-load for a race of this length.
Eat a carbohydrate-focused breakfast two to three hours before the start, and stick to something you've already tested in training rather than trying anything new.
Fluid at the on-course stations is usually enough; some runners take a single gel around the hour mark.
A mix of carbohydrate and protein in the hour or so after finishing supports recovery.
ATW Welwyn Half Marathon Charity Places 2026
No formal charity-place scheme published — runners commonly fundraise for a charity of their own choosing.
Lead with your personal story — explain why the charity matters to you. Personal connection generates 3x more support than a generic link broadcast.
Share key training milestones on Instagram (first 10-miler, peak week, race week) with your fundraising link in bio. Publicly thanking donors prompts secondary gifts!
Running ATW Welwyn Half Marathon for charity?
Link your JustGiving page to Verus and show up right here alongside other ATW Welwyn Half Marathon fundraisers — goal, progress and story, all in one place.
Add Your Fundraiser to VerusATW Welwyn Half Marathon Frequently Asked Questions
Everything you need to know for race weekend.
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Race details independently compiled and fact-checked by Tommo against the official ATW Welwyn Half Marathon site , last verified August 2026. Always confirm official timings and policies directly prior to race day.