Only 30 people have signed up so far for a charity race that is taking place for the first time next month.
The Ashridge Half Marathon is being staged to raise money for Rennie Grove Hospice Care on Sunday, June 16.
The maximum number of entries its organisers can accept is 250. Entry is just £17, but each participant is asked to raise £100 in sponsorship for the good cause.
In contrast, the St Albans Half Marathon – scheduled for Sunday, June 9 – costs £24 to enter, but last week sold out for the first time in its 32-year history.
Proceeds from that race are split between charities Everyman and the Willow Foundation.
Rennie Grove spokesman Gemma Baxter said: “We know there are a lot of events out there and there are other half marathons going on in other areas at similar times. We would just really like people to do our event, because it makes such a difference.”
Organisers had hoped that the chance to run on trails through Ashridge – an Area of Outstanding Natural Beauty – would attract people from a wider area.
Rennie Grove Hospice Care was recently renamed after a merger between Tring-based Iain Rennie Hospice at Home and Grove House in St Albans. Sign up to its race at www.ashridgehalfmarathon.org