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One of the best Vistas you will ever see of the Meon Valley. Old Winchester Hill in the foreground with excellent flora and fauna to explore.

Old Winchester Hill NNR


Adonis Blues have struggled here since recent re-introduction, although the grazing by herdwick sheep should help numbers remain stable

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The Silver-Spotted Skipper is quite common on parts of the downland, and its well looking for the mating ritual which is quite elaborate for butterflies!

Chalkhill Poo Old Winchester Hill August

In the summer months of late June and July the slopes are 'shimmering' with Chalkhill Blue butterflies, literally counted in their thousands. 


The Duke of Burgundy has several colonies on Old Winchester Hill but are well spread out and very small. The Cowslip foodplant is also very hard to find.

Small Heath OWH June 2015.jpg

The Small Heath is quite common on the downland the second brood in August being the more numerous.


The Brown Argus has two broods one in the spring and another in late summer, they can be seen on the lower slopes where there is good ground flora.


I cover Old Winchester Hill on my page '36 years and counting...' as I spend a lot of my butterfly year on Old Winchester Hill it deserves two pages. This is me counting Silver-Spotted Skippers in September when most of the main butterfly populations have dwindled, and makes counting this species a lot easier.



  • National Nature Reserve on chalk downland owned and managed by English Nature.

  • Site crowned by Iron Age hill fort providing fine views.

  • Chalkhill Blue can be very numerous across the site.

  • Other species include Dark Green Fritillary, Adonis Blue, Silver-spotted Skipper, Grizzled Skipper, Dingy Skipper and Clouded Yellow.

  • The possibility also to see Duke of Burgundy, although numbers very small.


Old Winchester Hill is a National Nature Reserve on the South Downs just east of the village of Warnford in the Meon valley. It is also the site of an Iron Age hill fort with many prehistoric features still visible, such as earthworks, barrows and tumuli. The flat-topped summit of the fort itself, complete with triangulation pillar provides fine views. This large nature reserve is noted especially for its flora, which includes at least 6 species of orchid, and of course for its butterflies.


The hill can be prolific for Chalkhill Blue, and there is also a reasonable population of Dark Green Fritillary, as well as common downland species. Silver-spotted Skipper are present in multiple locations, though numbers can be variable from year to year. Efforts have been made by English Nature since the early 2000's to re-introduce Adonis Blue to Old Winchester Hill, and after a few up and down years, the species now seems to be doing quite well here. For this feature, it is convenient to use two widely separated locations which are both good for butterflies, since other areas of the reserve can be readily accessed from one or other of them. I will assume access is from the main car park (map), however for the fort area, there is also limited road parking close to pedestrian entrances further south along the minor road. 


The first location is at the bottom of the car park slope. Hence, from the car park, enter the reserve through the gate and turn almost immediately right, passing in front of a gazebo shaped structure containing visitor information (take a look!). Continue through another gate and head straight down the grassy slope. Depending on the time of year, species which can be found on this heavy rabbit grazed area include Chalkhill Blue, Meadow Brown and Small Heath. Towards the bottom of the slope, just before the path takes a left turn, pause and look around. The area of more varied vegetation to your left (map) and in front of you, is a good location to look for several species, depending on timing. In this area, there are Common Blue and I have seen (in small numbers) Grizzled Skipper, Dingy Skipper and even Green Hairstreak. Chalkhill Blue can be present in significant numbers and it is also an area where Adonis Blue can be found. In August you may be lucky to find a few Silver-spotted Skippers either on the grassy path down the slope or in the shorter sward area, but the species can be somewhat scarce here.


If you continue along the path as it turns, you reach an area of steep open downland (Photo 1 at top of page). Look here for fast-flying Dark Green Fritillaries during July. However, this very active species rarely seems to settle for long on this site and can be difficult to photograph. The verdant lower slopes of this downland, before it meets woodland, are one of the locations on this large reserve where a few Duke of Burgundy have been recorded in recent years (during May). However, departing from the paths is discouraged, bearing in mind the site was used in World War II for mortar testing. Hence, staying on the path, you enter this woodland and emerge a few minutes later into another area of downland. It is uphill from here, keeping to the paths, to the fort area which is close to the second location I have selected for this site feature. However, I will describe the route to the fort as if making a separate visit, starting from the car park.


Clouded Yellow butterflies are mainly migrants from Europe and are seen on the downland in mid-summer through to the end of the Autumn. They do overwinter now due to global warming, and have bred on Old Winchester Hill.


In this case, after entering the reserve from the car park, just continue along the main path. The fort is just over 1km from the car park, the path heading south parallel to the road for about half that distance, before turning right towards the fort. In the first section, Marbled White can be numerous amongst the long grasses, as well as Small/Essex Skippers, Meadow Brown and Chalkhill Blue. It is notable that the latter species can be found in almost all grassland areas of the reserve at the peak of their season. Some areas of the fort area itself (such as the ramparts) may be roped off to protect nesting birds, but butterflies are normally plentiful even along the rampart edges (Chalkhill Blue, Small Heath, Small/Essex Skipper, Meadow Brown, Painted Lady) and a full circuit around the fort is worthwhile if time permits.


The second specific area to explore is the south field (here) which is accessed via an open gate on the south side of the fort (shown in Photo 2 above). The lower part of the slope and the scrub area towards the bottom, are usually the best places for butterflies with a good variety of both common and scarcer species. Appropriate grazing has improved this area in recent years and it is now possibly the single most productive location on the whole site for butterflies. Chalkhill Blues can be very numerous here and there are reasonable populations of Adonis Blue and Silver-spotted Skipper, as well as the more common downland species, such as Common Blue, Brown Argus and Small Heath. In late summer and early autumn, the sight of a Clouded Yellow circuiting the area is not unusual, stopping briefly to feed on the rich variety of nectar sources.

Old Winchester Hill June 2014.jpg

The car-park slope its great going down...but not for the faint hearted coming back up!

Herwick Sheep OWH August 2015.jpg

Herdwick Sheep have been on the slopes of Old Winchester Down now for many years now and keep the sward to a level ideal for the Adonis Blue and Silver-Spotted Skipper butterflies. 

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