This calendar has been compiled by the Hertfordshire Natural History Society (HNHS) on behalf of natural history organisations in Hertfordshire. The type of event is colour coded: Outdoor events, Indoor meetings.
Sat 18 Apr 2026 (10am)
Burnham Green area area for spring wildlife
Park on village roads and meet on the village green. TL 262 165, W3W frogs.risk.winks
Organised by: British Naturalists Association, Herts Branch
Tue 28 Apr 2026 (10:30)
Winter-spring Bryophyte Meeting 4/4
Meetings usually start at 10.30am and continue until mid-afternoon. Please contact Agneta Burton (m.a.s.burton@btinternet.com) for further details and if you wish to join the mailing list for the group.
Organised by: Other
Wed 13 May 2026 (8pm)
Conservation work at Hillfield Park reservoir
This talk by Josh Kalms of the HMWT will focus on recent major works to improve habitat on this important local wetland area
Organised by: RSPB Watford Local Group
Tue 26 May 2026 (7.30pm for 8pm)
The status of butterflies in Hertfordshire and Middlesex
The speaker is county butterfly recorder Andrew Wood, author of 'Butterflies of Hertfordshire and Middlesex'.
The United Reformed Church Hall, Mill Lane, Broxbourne, EN10 7BG (Wheelchair accessible)
Organised by: RSPB South East Herts Group
Sun 07 Jun 2026 (9.30am)
Heartwood forest walk
In early June the forest is buzzing with summer wildlife attracted to the wildflower meadows and nesting birds are actively feeding their hungry offspring. Meet at Heartwood Forest car park. Nearest postcode: AL4 9DQ.
Organised by: RSPB South East Herts Group
Wed 17 Jun 2026 (9.45am)
Therfield Heath walk
For farmland birds, spring migrants and butterflies. Meet in the Royston Heath Sports Centre car park. Postcode SG8 5BG. (T).
Organised by: RSPB South East Herts Group
Wed 15 Jul 2026 (9.45am)
Broxbourne Woods and Heath walk
. A wander through this area is excellent for butterflies, dragonflies and other insects. Meet at 9.30am Free parking at Broxbourne Woods West car park. Postcode SG13 8NZ.
Organised by: RSPB South East Herts Group