Compiled and fact-checked by Tommo, Verus founder · Last verified August 2026 · Spot an error?
Running · Half Marathons
Hertfordshire Half Marathon 2026
- Race day
- Sunday, 1 November 2026
- Location
- Knebworth, Hertfordshire, UK
- Distance
- 13.1 mi / 21.1 km
Hertfordshire Half Marathon: 1 November 2026. Entry, course, charity, a pace calculator.
Hertfordshire Half Marathon Race Timeline
52 days to go
This is where the real training happens — building your long run and getting comfortable with half-marathon race-pace.
Hertfordshire Half Marathon 2026: quick answers
When is Hertfordshire Half Marathon 2026?
Hertfordshire Half Marathon 2026 takes place on Sunday, 1 November 2026, starting at 9:00am (the Hertfordshire 10K starts 30 minutes later at the same venue).
What time does Hertfordshire Half Marathon start?
Hertfordshire Half Marathon starts at 9:00am (the Hertfordshire 10K starts 30 minutes later at the same venue) from Knebworth House, Old Knebworth Lane, Knebworth.
Where does Hertfordshire Half Marathon start and finish?
Hertfordshire Half Marathon starts at Knebworth House, Old Knebworth Lane, Knebworth and finishes at Knebworth House, Old Knebworth Lane, Knebworth.
How many miles is Hertfordshire Half Marathon?
Hertfordshire Half Marathon is 13.1 miles (21.1km).
How much elevation gain does Hertfordshire Half Marathon have?
Hertfordshire Half Marathon has approximately 302ft of total elevation gain. No — RunThrough describes the course as undulating, running through Knebworth Park and the surrounding countryside lanes rather than flat closed roads in a city centre. Independent course-mapping sites put total elevation change at around 302ft (92m), though this isn't a figure the organizer publishes officially — expect rolling country-lane terrain.
How much does Hertfordshire Half Marathon cost to enter?
Entry is direct via RunThrough Events — no qualifying time or ballot. Half Marathon entry was £45 as of Aug 2026; always confirm the current price on the official site, as it typically rises closer to race day.
How can I track a runner at Hertfordshire Half Marathon?
No dedicated live-tracking app is advertised for this event — check the official RunThrough race page for any updates closer to race day.
Key Race Metrics & Overview
- Date
- Sunday, 1 November 2026
- Distance
- 13.1 miles / 21.1km
- Location
- Knebworth, Hertfordshire, UK
- Start Point
- Knebworth House, Old Knebworth Lane, Knebworth
- Finish Point
- Knebworth House, Old Knebworth Lane, Knebworth
- Start time
- 9:00am (the Hertfordshire 10K starts 30 minutes later at the same venue)
- Elevation gain
- 302 ft (92m)
- Surface
- Closed public and estate roads, tarmac
- Cut-off time
- Around 3 hours from the start (roughly 12:00 for a 9:00 start), after which roads reopen to traffic — confirm the exact cut-off on the official site.
- Tracking app
- No dedicated live-tracking app is advertised for this event — check the official RunThrough race page for any updates closer to race day.
Not published by the organiser at the time of writing: age requirement. Verus records these as unconfirmed rather than estimating them — check the official race website closer to race day.
Direct Entry Summary
Entry is direct via RunThrough Events — no qualifying time or ballot. Half Marathon entry was £45 as of Aug 2026; always confirm the current price on the official site, as it typically rises closer to race day.
Ballot Policy
No ballot — entry is first come, first served via RunThrough Events.
Hertfordshire 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.
Hertfordshire Half Marathon Route Map & Elevation Profile
Starting at Knebworth House, Old Knebworth Lane, Knebworth and finishing at Knebworth House, Old Knebworth Lane, Knebworth. 302 ft of total elevation gain across 13.1 miles.
Is Hertfordshire Half Marathon flat?
No — RunThrough describes the course as undulating, running through Knebworth Park and the surrounding countryside lanes rather than flat closed roads in a city centre. Independent course-mapping sites put total elevation change at around 302ft (92m), though this isn't a figure the organizer publishes officially — expect rolling country-lane terrain.
Hertfordshire Half Marathon Course Profile
302 ft total elevation gain.
Tap a point on the course for details.
Knebworth House, Old Knebworth Lane, Knebworth
Start line.
Knebworth Park
The route starts by running through the grounds of Knebworth Park before heading out onto the surrounding lanes.
Rural Hertfordshire lanes
The organizer describes this stretch as undulating — independently-cited total elevation gain across the course is around 302ft (92m), though no official mile-by-mile breakdown is published.
Where Hertfordshire 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 Hertfordshire Half Marathon Route Breakdown
A closed-road, chip-timed route starting and finishing at Knebworth House. It runs through the grounds of Knebworth Park before heading out onto the surrounding rural Hertfordshire lanes — described by the organizer as fully traffic-free — then returns to finish back at Knebworth House.
Hertfordshire Half Marathon Pace Calculator & Splits
Hertfordshire 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
Hertfordshire 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 |
Hertfordshire Half Marathon Finish Time Estimator
Enter a recent 5K, 10K or Half Marathon time to estimate your Hertfordshire Half Marathon finish time.
Your 5K time
Estimated Hertfordshire 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 Hertfordshire Half Marathon, set your goal pace, and let Verus track your countdown, training and fundraising in one place.
Start Your Verus JourneyHertfordshire 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 — this is a rural, open-countryside course with less shelter than a city race
- Your own gels/fuel, since on-course drink station contents for this event weren't published at the time of writing
- A plan for reaching Knebworth — the village has its own railway station on the East Coast Main Line
- A meeting point agreed with family/friends at Knebworth House for after the race
Training Strategy for Hertfordshire 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 Knebworth House, Old Knebworth Lane, Knebworth 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 usual approach to topping up glycogen stores for a half marathon.
2-3 hours before the start, eat something carb-heavy that you've already used in training — race morning is the wrong time to try something new.
On-course drink station contents for this event weren't published at the time of writing — carry your own gels/fuel if you have specific needs.
Recovery starts with what you eat in that first hour — a mix of carbohydrate and protein is what the evidence supports — check what's available at Knebworth House post-race, or plan to head into Stevenage or Welwyn Garden City for a proper meal.
Hertfordshire Half Marathon Charity Places 2026
The event's official charity partner is Garden House Hospice Care. RunThrough also supports fundraising places for other charities on request — there's no universal minimum published, so contact RunThrough or the charity directly for current terms.
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 Hertfordshire Half Marathon for charity?
Link your JustGiving page to Verus and show up right here alongside other Hertfordshire Half Marathon fundraisers — goal, progress and story, all in one place.
Add Your Fundraiser to VerusWhere to Stay for Hertfordshire Half Marathon
Knebworth / Stevenage
Closest to the start and finish at Knebworth House — realistic to walk or take a short local journey on race morning.
A small village with limited hotel choice; Stevenage itself has more options a short drive or train ride away.
Welwyn Garden City / Hatfield
More hotel choice than Knebworth itself, still a short train journey away on the same rail line.
Not walking distance — you'll need to factor in getting to Knebworth on race morning.
Travel & Logistics
Knebworth has its own railway station on the East Coast Main Line, a short walk from Knebworth House — the simplest way in if you're not driving.
Not applicable — check the official event page for on-site parking availability and any restrictions around Knebworth House on race day.
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
Knebworth Park itself, right by the start and finish at Knebworth House, is the easiest spot to watch from without needing to travel out onto the closed country lanes.
Because the route loops back through Knebworth Park, spectators based near the start/finish can often see runners pass more than once without moving far.
No dedicated live-tracking app is advertised for this event — check the official RunThrough race page for any updates closer to race day.
Hertfordshire 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 Hertfordshire Half Marathon site , last verified August 2026. Always confirm official timings and policies directly prior to race day.