Know before you go
Parking informationPark on the roadside at end of Half Moon Lane
Grazing animalsGrazed with cattle and ponies
Mostly firm and dry; steep uphill gradient. Minor paths are slippery when wet.
When to visit
Opening timesOpen at all times
Best time to visitSpring and Summer
About the reserve
The steep chalk hills rising from the edges of Luton and Dunstable have allowed this site to retain grassland full of colour, with areas of scrub providing shelter for birds and insects. The reserve includes a small disused quarry and banks associated with Medieval cultivation terraces. Similar sites have declined nationally and because this reserve is a fine example of this habitat, it is a designated Site of Special Scientific Interest. The views from the top are well worth the climb. The slopes themselves are covered with flower-rich grassland, home to possibly the largest population of great pignut in the county. In spring, orchids dot the hillsides, followed by the late summer hues of wildflowers such as scabious and knapweeds. The steepest banks where the soils are very thin and nutrient-poor are where less competitive, lower-growing herbs can flourish.
These include horseshoe vetch, common rock-rose and kidney vetch, the foodplants of the specialist chalk butterflies chalkhill blue, brown argus and small blue. In spring and autumn, migrant birds stop off at Blow’s Downs to feed before heading off once again on their way to their nesting or wintering grounds. Wheatear, stonechat, whinchat and ring ouzel are among the most notable seasonal visitors. We prevent woodland succession on the grassland by grazing with cattle and ponies, and by removing scrub. To compensate for wildlife habitat lost to the Guided Busway, three acres of land were added to Blow’s Downs nature reserve. The Paddocks, the Hayfield and Chaul End field are all now managed for the benefit of wildlife. We have regular work parties in our North Chilterns Chalk reserves; see our website for details.