Compiled and fact-checked by Tommo, Verus founder · Last verified August 2026 · Spot an error?
Running · Half Marathons
Watford Half Marathon 2027
- Race day
- Sunday, 7 February 2027
- Location
- Watford, Hertfordshire, UK
- Distance
- 13.24 mi / 21.3 km
Watford Half Marathon: 7 February 2027. Entry, the hilly Cassiobury Park course, charity, a pace calculator.
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.
Watford Half Marathon 2027: quick answers
When is Watford Half Marathon 2027?
Watford Half Marathon 2027 takes place on Sunday, 7 February 2027, starting at 10:00am (starts together with the Watford 10K, which diverges onto its own route at 4km).
What time does Watford Half Marathon start?
Watford Half Marathon starts at 10:00am (starts together with the Watford 10K, which diverges onto its own route at 4km) from Cassiobury Park, Watford.
Where does Watford Half Marathon start and finish?
Watford Half Marathon starts at Cassiobury Park, Watford and finishes at Cassiobury Park, Watford.
How many miles is Watford Half Marathon?
Watford Half Marathon is 13.24 miles (21.3km).
How much elevation gain does Watford Half Marathon have?
Watford Half Marathon has approximately 751ft of total elevation gain. No — independent reviewers frequently describe the course as hilly ("Chilly and Hilly" is a common nickname among regular entrants), and the organizer's own interactive elevation tool puts total gain at 751ft (229m) across the country-lane loop through Bucks Hill, Commonwood Common and Chandlers Cross. This is a genuinely undulating course, not a flat PB-hunting one.
How much does Watford Half Marathon cost to enter?
Entry is direct via Active Training World — no ballot. Half Marathon entry tiers were £43 (affiliated) to £45 (unaffiliated) as of Aug 2026, rising from an earlier £36-£38 tier; always confirm current pricing on the official site.
How can I track a runner at Watford Half Marathon?
No dedicated live-tracking app is advertised for this event — check the official ATW event page for updates closer to race day.
Key Race Metrics & Overview
- Date
- Sunday, 7 February 2027
- Distance
- 13.24 miles / 21.3km
- Location
- Watford, Hertfordshire, UK
- Start Point
- Cassiobury Park, Watford
- Finish Point
- Cassiobury Park, Watford
- Start time
- 10:00am (starts together with the Watford 10K, which diverges onto its own route at 4km)
- Elevation gain
- 751 ft (229m)
- Surface
- Closed public roads, tarmac, country lanes
- Cut-off time
- Two hours forty-five minutes to the 11-mile point, after which roads reopen to traffic.
- Age requirement
- Runners must be 17 or over on race day.
- Tracking app
- No dedicated live-tracking app is advertised for this event — check the official ATW event page for updates closer to race day.
Direct Entry Summary
Entry is direct via Active Training World — no ballot. Half Marathon entry tiers were £43 (affiliated) to £45 (unaffiliated) as of Aug 2026, rising from an earlier £36-£38 tier; always confirm current pricing on the official site.
Ballot Policy
No ballot — entry is first come, first served via Active Training World.
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.
Watford Half Marathon Route Map & Elevation Profile
Starting at Cassiobury Park, Watford and finishing at Cassiobury Park, Watford. 751 ft of total elevation gain across 13.24 miles.
Is Watford Half Marathon flat?
No — independent reviewers frequently describe the course as hilly ("Chilly and Hilly" is a common nickname among regular entrants), and the organizer's own interactive elevation tool puts total gain at 751ft (229m) across the country-lane loop through Bucks Hill, Commonwood Common and Chandlers Cross. This is a genuinely undulating course, not a flat PB-hunting one.
Watford Half Marathon Course Profile
751 ft total elevation gain.
Tap a point on the course for details.
Cassiobury Park, Watford
Start line.
Cassiobury Park start
The route heads out from Cassiobury Park towards the surrounding countryside.
Bucks Hill, Commonwood Common & Chandlers Cross loop
+751ft (229m) — A roughly six-mile loop through rural lanes between miles 4 and 10 — the source of the course's "Chilly and Hilly" nickname, and effectively all of the route's elevation gain.
Where Watford Half Marathon starts and finishes
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. The official course map is the one to use: view it on the organiser's site .
Full Watford Half Marathon Route Breakdown
A closed-road route starting and finishing in Cassiobury Park. After the opening stretch, the course heads out through country lanes behind The Grove Hotel & Golf Course, via Bucks Hill, Commonwood Common and Chandlers Cross, before looping back to Cassiobury Park — including a roughly six-mile loop through rural lanes between miles 4 and 10.
Watford Half Marathon Pace Calculator & Splits
Watford Half Marathon Pace Calculator
Enter a target finish time to see your pace and projected splits.
Average pace / mile
18:08
Average pace / km
11:16
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 | Half Marathon | Finish |
|---|---|---|---|---|---|---|
| 3:00 | 13:36 | 8:27 | 42:14 | 1:24:29 | 2:58:13 | 3:00:00 |
| 3:15 | 14:44 | 9:09 | 45:45 | 1:31:31 | 3:13:05 | 3:15:00 |
| 3:30 | 15:52 | 9:51 | 49:17 | 1:38:33 | 3:27:56 | 3:30:00 |
| 3:45 | 17:00 | 10:34 | 52:48 | 1:45:36 | 3:42:47 | 3:45:00 |
| 4:00 | 18:08 | 11:16 | 56:19 | 1:52:38 | 3:57:38 | 4:00:00 |
| 4:15 | 19:16 | 11:58 | 59:50 | 1:59:41 | 4:12:29 | 4:15:00 |
| 4:30 | 20:24 | 12:40 | 1:03:21 | 2:06:43 | 4:27:20 | 4:30:00 |
| 4:45 | 21:32 | 13:23 | 1:06:53 | 2:13:45 | 4:42:11 | 4:45:00 |
| 5:00 | 22:40 | 14:05 | 1:10:24 | 2:20:48 | 4:57:02 | 5:00:00 |
| 5:30 | 24:55 | 15:29 | 1:17:26 | 2:34:52 | 5:26:45 | 5:30:00 |
| 6:00 | 27:11 | 16:54 | 1:24:29 | 2:48:57 | 5:56:27 | 6:00:00 |
| 6:30 | 29:27 | 18:18 | 1:31:31 | 3:03:02 | 6:26:09 | 6:30:00 |
| 7:00 | 31:43 | 19:43 | 1:38:33 | 3:17:07 | 6:55:51 | 7:00:00 |
Watford Half Marathon Finish Time Estimator
Enter a recent 5K, 10K or Half Marathon time to estimate your Watford Half Marathon finish time.
Your 5K time
Estimated Watford Half Marathon finish
1:56:13
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 Watford Half Marathon, set your goal pace, and let Verus track your countdown, training and fundraising in one place.
Start Your Verus JourneyWatford 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 for a February country-lane course — expect it to be genuinely cold
- Your own gels/fuel, since on-course water/gel station details weren't published at the time of writing
- A plan for reaching Cassiobury Park — there's no organised event parking, so use Watford town centre or public transport
- A meeting point agreed with family/friends in Cassiobury Park for after the race
Training Strategy for 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 course has real climbs — bucks hill, commonwood common & chandlers cross loop around mile 7 — so include some hill-repeat sessions midweek rather than relying only on flat long runs.
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 modest increase in carbohydrate intake over the 2-3 days before the race — not one huge pasta dinner the night before — is the standard approach to topping up glycogen stores for a half marathon.
Eat a carb-focused breakfast 2-3 hours before the start, and stick to something you've already tested in training.
On-course water/gel station details weren't published at the time of writing — carry your own fuel if you have specific needs.
The first hour after finishing is when carbohydrate and protein do the most for recovery.
Watford Half Marathon Charity Places 2027
The event's official charity partner is Alzheimer's Research UK, with an optional donation add-on at checkout — there's no separate discounted charity-place scheme with other named charities published for this event.
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 Watford Half Marathon for charity?
Link your JustGiving page to Verus and show up right here alongside other Watford Half Marathon fundraisers — goal, progress and story, all in one place.
Add Your Fundraiser to VerusWhere to Stay for Watford Half Marathon
Watford town centre
The most hotel choice, close to Watford Junction and the Underground, and a short journey to Cassiobury Park.
Not walking distance to the park itself for most hotels.
Cassiobury Park / Nascot area
Closest to the start and finish — realistic to walk on race morning.
A residential area with limited hotel choice compared to the town centre.
Travel & Logistics
No organised parking is available at Cassiobury Park itself. Watford Metropolitan (Underground) station is about a 2-minute walk, Watford High Street station about 8 minutes, and Watford Junction (mainline) around 20-45 minutes on foot depending on route.
Not applicable — the official guidance is to use Watford town centre parking or public transport rather than driving directly to the park.
Roads around the course are closed for the duration of the event and reopen once the last finishers and marshals have cleared the route.
Spectator & Cheer Guide
Cassiobury Park itself, right by the start and finish, is the easiest spot to watch from without following the route out into the countryside.
Because the route loops back through Cassiobury Park, spectators based there can often see runners pass more than once without moving far.
No dedicated live-tracking app is advertised for this event — check the official ATW event page for updates closer to race day.
Watford 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 Watford Half Marathon site , last verified August 2026. Always confirm official timings and policies directly prior to race day.