Find great ideas for days out with kids in Hertfordshire and the best family friendly events happening summer 2025. The Hertfordshire summer holiday activities guide is packed full with big family days out or smaller, local ideas.   If you’re working and need childcare, then check out the summer holiday camps in Hertfordshire or check out our what’s on for summer Buckinghamshire guide.

Summer Activities & Events for Kids in Hertfordshire 2025

Summer Outdoor Adventures in Hertfordshire

• Summer Spectacular at Willows Activity Farm (St Albans) 1st July – 31st August
• Folk By The Oak Summer Family Festival at Hatfield House (Hatfield)  20th July
• Teddy Bear Picnic at Hertford Castle (Hertford) 21st July

Summer On The Farm with new Deer Meadow at Hogshaw Farm from 19th July

Hogshaw Farm & Wildlife Park is perfect for a fun family day out. There are lots of friendly farm animals and pets to meet and more unusual animals in the Wildlife Zone. Jump off some energy on the giant bouncy pillow or indoor soft play plus lots more activities.  There are lots of extras this summer from From animal encounters and tractor rides, to bug hunts, summer splash pool and adventure play, there’s plenty to keep outdoor explorers of all ages occupied this summer!

• KidFest at Lee Valley Animal Adventure Park (Waltham Abbey) 23rd July – 31st August
• Watford Carnival (Watford) 2nd August
• Luton Point’s Festival of Fun (Luton) 28th July – 29th August FREE

Watford Big Beach (Watford) 15th – 31st August FREE

With Watford Borough Council’s Big Beach, you don’t need to travel to the coast to feel the sand between your toes – just head into town! The beach is completely free – and is the perfect chance for people of all ages to lap up the summer sun, with deck chairs and tables provided to help you relax.

• Watford Community Fun Day (Watford) 16th August

Indoor Summer Events for Kids in Hertfordshire

• Family Summer Holiday Programme at Verulamium Museum (St Albans) 24th July – 2nd September
• Archology for Families at Verulamium Museum (St Albans) 29th July, 12th and 19th August
• Printing Workshop for Families at St Albans Museum (St Albans) 6th August
• North Herts Museum (Hitchin) tbc

Summer Family Friendly Theatre Shows in Hertfordshire

• Pop Princesses at the Radlett Centre (Radlett) 7th August
• Big Screen at Knutsford Playing Fields (Watford) 11th – 17th August FREE
• Koala Who Could at the Radlett Centre (Radlett) 15th and 16th July
• Dinosaur Wild Live at The Alban Arena (St Albans) 18th – 20th July
• Stage and Screen Week at Hatfield House (Hatfield) 28th July – 3rd August
• Watford Palace Theatre (Watford) TBC
• Twelfth Night by Changeling theatre at Hatfield House (Hatfield) 29th July