Compiled and fact-checked by Tommo, Verus founder · Last verified August 2026 · Spot an error?
Running · Half Marathons
ATW Watford Half Marathon 2027
- Race day
- Sunday, 7 February 2027
- Location
- Watford, Hertfordshire, UK
- Distance
- 13.1 mi / 21.1 km
ATW Watford Half Marathon: 7 February 2027, from Cassiobury Park, Watford. Entry, route, a pace chart and the race-day forecast.
ATW Watford Half Marathon Race Timeline
150 days to go
More than 56 days out — a good window to build a consistent base before half-marathon-specific training ramps up.
ATW Watford Half Marathon 2027: quick answers
When is ATW Watford Half Marathon 2027?
ATW Watford Half Marathon 2027 takes place on Sunday, 7 February 2027.
Where does ATW Watford Half Marathon start and finish?
ATW Watford Half Marathon starts at Cassiobury Park, Watford and finishes at Cassiobury Park, Watford.
How many miles is ATW Watford Half Marathon?
ATW Watford Half Marathon is 13.1 miles (21.1km).
How much does ATW Watford Half Marathon cost to enter?
Entry direct through Active Training World — check the official site for current pricing.
Key Race Metrics & Overview
- Date
- Sunday, 7 February 2027
- Distance
- 13.1 miles / 21.1km
- Location
- Watford, Hertfordshire, UK
- Start Point
- Cassiobury Park, Watford
- Finish Point
- Cassiobury Park, Watford
- Surface
- Parkland paths and road
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 Watford 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 Watford Half Marathon Route Map & Elevation Profile
Starting at Cassiobury Park, Watford and finishing at Cassiobury Park, Watford. Total elevation gain is not published for this event, and Verus does not estimate one.
Is ATW Watford Half Marathon flat?
No official elevation figure is published for this course, so Verus doesn't state one. The organiser describes the going as: parkland paths and road.
ATW Watford Half Marathon Course Profile
Elevation change not published for this event.
Tap a point on the course for details.
Cassiobury Park, Watford
Start line.
Where ATW Watford Half Marathon starts and finishes
ATW Watford Half Marathon starts at Cassiobury Park, Watford and finishes at Cassiobury Park, Watford. 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 Watford Half Marathon Route Breakdown
A February half from Cassiobury Park — one of the earliest road halves in the Hertfordshire calendar, which makes it a common spring-marathon tune-up. A 10K and a fun run go off the same morning.
ATW Watford Half Marathon Pace Calculator & Splits
ATW Watford 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 Watford 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 Watford Half Marathon Finish Time Estimator
Enter a recent 5K, 10K or Half Marathon time to estimate your ATW Watford Half Marathon finish time.
Your 5K time
Estimated ATW Watford 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 Watford Half Marathon, set your goal pace, and let Verus track your countdown, training and fundraising in one place.
Start Your Verus JourneyATW Watford 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 Cassiobury Park, Watford
- A meeting point agreed with family and friends for after the race
Training Strategy for ATW Watford 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 Cassiobury Park, Watford 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 Watford Half Marathon Charity Places 2027
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 Watford Half Marathon for charity?
Link your JustGiving page to Verus and show up right here alongside other ATW Watford Half Marathon fundraisers — goal, progress and story, all in one place.
Add Your Fundraiser to VerusATW Watford Half Marathon Frequently Asked Questions
Everything you need to know for race weekend.
People Also Search For
Similar races
Watford Half Marathon
Watford, Hertfordshire, UK
Berkhamsted Half Marathon
Berkhamsted, Hertfordshire, UK
Hertfordshire Half Marathon
Knebworth, Hertfordshire, UK
Stevenage Half Marathon
Stevenage, Hertfordshire, UK
Welwyn Half Marathon
Welwyn Garden City, Hertfordshire, UK
St Albans Half Marathon
St Albans, Hertfordshire, UK
Race details independently compiled and fact-checked by Tommo against the official ATW Watford Half Marathon site , last verified August 2026. Always confirm official timings and policies directly prior to race day.