Races Half marathon · Knebworth, UK
Hertfordshire Half Marathon
Hertfordshire Half Marathon is a rolling half marathon in Knebworth, UK, held each November. Starts in Knebworth Park, then follows undulating country lanes on closed roads. A listing gives about 218 m of climbing over the half, so there is steady up and down rather than one big climb. Early November in Hertfordshire is cool and damp, typically 4 to 11°C. Knebworth's rolling course rewards effort-based pacing — hold steady effort on the rises and let the pace return on the descents.
Page rebuilt 2026-11-14 · race facts not independently verified — confirm dates and entries on the official race site
When
November
next: Sunday 7 November 2027
Course
rolling
Half marathon
Conditions
Early November in Hertfordshire is cool and damp, typically 4 to 11°C.
Racing this course well
Starts in Knebworth Park, then follows undulating country lanes on closed roads. A listing gives about 218 m of climbing over the half, so there is steady up and down rather than one big climb.
Knebworth's rolling course rewards effort-based pacing — hold steady effort on the rises and let the pace return on the descents.
Getting a place
- How you get in
- Open entry: first come, first served
- Price
- From £31 super early bird, then £36, plus a 5% booking fee (2027 race)
Official Hertfordshire Half Marathon site →Checked November 2026
Race day
- Next race
- Sunday 7 November 2027
- Start time
- 09:00
- Also on the day
- 10k
The course in numbers
- Layout
- Loop
- Surface
- Park grounds and closed country roads
- Total climb
- 220 m
Getting there
- Rail station
- Stevenage, about 2.3 miles from the start
Pick your goal for Knebworth
Pace charts, weekly structure and timelines for the most common half marathon goals:
The date shown is the one the organiser has announced. Change it if yours differs.
Build your training around Hertfordshire Half Marathon.
RunV works backwards from race day to today. Your plan adapts when life interrupts, and you approve every change. It does not adapt to this specific course — the pacing guidance above is where the course knowledge is.
Everything above stays free and complete — this is an optional next step, not a paywall.
Asked often
- When is the Hertfordshire Half Marathon?
- The next Hertfordshire Half Marathon is on Sunday 7 November 2027 in Knebworth, UK. It is held each November.
- Is the Hertfordshire Half Marathon course flat?
- Starts in Knebworth Park, then follows undulating country lanes on closed roads. A listing gives about 218 m of climbing over the half, so there is steady up and down rather than one big climb.
- How do I enter the Hertfordshire Half Marathon?
- Open entry: first come, first served. Price: From £31 super early bird, then £36, plus a 5% booking fee (2027 race).
- How should I train for the Hertfordshire Half Marathon?
- Match your preparation to Hertfordshire Half Marathon's profile and the November weather, then protect consistency — with RunV Premium you can adapt your plan to fit your week, so one bad week never derails the block.
Not sure what to target? Predict your half marathon time from a recent race →
More half marathon races
Supplements research for this distance
Build for Knebworth — around your actual life
RunV engineers your block backwards from race day in November — and adapts it when training doesn't go to script. You approve every change.
