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Two hundred and twenty-three species of bird have been recorded on three small rocks in the Dee, and a grey seal colony of several hundred lives on the bank beyond. Here is what to look for in each month, and when to go to see it.
This month
October: Autumn colour. Waders build back to winter numbers and brent geese climb past a hundred. Goldcrests, thrushes and finches drop in on passage. The Friends of Hilbre usually hold their last open day of the year. Jump to October.
Tens of thousands of waders use the estuary and the islands are their roost when the tide pushes them off the mud. Pale-bellied brent geese, a Hilbre speciality, feed round Little Eye in flocks of 200 or more. Purple sandpipers pick over the weedy rocks. A few goosander and common scoter offshore. Seals present but fewer.
When to go: Big spring tides, an hour before high water, from the north end or Middle Eye. Short daylight windows, so plan carefully.
The observatory logged 12,000 oystercatchers, 2,000 dunlin, 280 brent geese and up to 16 purple sandpipers in February 2026. Harbour porpoise show offshore on calm days. The first chiffchaff can be ringed in the last week.
When to go: Cold, bright days after a blow. Bring a scope for the porpoise.
Winter waders begin to thin, purple sandpipers stay to the end of the month, and the first wheatears and meadow pipits of spring drop onto the islands. Seals start to build again on the bank.
When to go: Any calm morning window. Watch the grass on Hilbre for wheatear.
Migration builds through the month towards its peak in the last week. Night migrants arrive at dawn and, the observatory notes, are usually gone by nine. Sandwich terns are back in the estuary.
When to go: The first hour of a morning window. Later starts miss the birds.
Passage peaks up to about the 10th: willow warblers, swallows, wheatears, pipits, the odd scarcity. The brent geese leave. Long windows and lengthening evenings.
When to go: Early morning for migrants; any time for seals.
The quietest month for birds and the best for rock pooling on the low spring tides: beadlet anemones, hermit crabs, shrimps, gobies, and the honeycomb-worm reef crusts on the western shore. Seal numbers climbing.
When to go: Low water on a spring tide for the pools. Put everything back as you found it.
Grey seals hauled out on West Hoyle Bank head towards their summer peak, with terns fishing offshore and family rock-pooling in the long windows. The busiest weekends of the year on the sands.
When to go: Low water, from the north end of Hilbre, with binoculars. Never walk out towards the bank.
The colony's annual maximum has topped 500, with 579 counted in August 2000 and 225 on one August 2025 morning. The first returning waders and wheatears appear, sandwich terns gather in flocks, and autumn migration is under way from early in the month.
When to go: Low water for seals. Any morning for the first migrants.
Hilbre is nationally known as a place to see Leach's storm petrel, blown into Liverpool Bay by north-westerly gales: 131 passed on 20 September 2026 with arctic and great skuas, a grey phalarope and an osprey. The brent geese return. Heritage Open Days and Friends' open days fall this month.
When to go: Strong north-west wind with a big tide, from the north end. Wrap up.
Waders build back to winter numbers and brent geese climb past a hundred. Goldcrests, thrushes and finches drop in on passage. The Friends of Hilbre usually hold their last open day of the year.
When to go: Morning windows after a clear night for grounded migrants.
The purple sandpipers are back on the rocks for the winter and the big roosts pack Little Eye and Middle Eye on spring tides. Short, sometimes dark, windows: check the 7-day forecast for one in daylight.
When to go: High water on a big tide for the roosts, watched from a distance.
Peak waders and wildfowl. Storms push the roosts onto the islands themselves, so keep to the paths and give them room. Brent geese at their most numerous; the Hilbre record was 360 in late December 2017.
When to go: The daylight window, whatever hour it falls. Be back before dusk.
The grey seals you see from Hilbre haul out on West Hoyle Bank, the sandbank off the north-west end of the island, and have done since the 1920s. They are there in every month, fewest in winter and most in summer; the colony's yearly maximum has exceeded 500. They do not breed at Hilbre: most head off to breeding grounds elsewhere in the autumn and return after. The occasional grey seal with a pup on the island's rocks is a rarity, not the norm.
Watch from the north end of Hilbre with binoculars. Never walk out across the sand towards the bank: there is a channel between, the seals will stampede into the water, and the Marine and Coastal Wildlife Code asks for at least 100 metres. The same goes for drones.
Sources: Hilbre Bird Observatory daily log (2025 to 2026), Wirral Council Hilbre Islands LNR Management Plan 2024 to 2029, Cheshire Wildlife Trust grey seal species plan, Dee Estuary Birding, RSPB Chester and Liverpool local groups, Wildlife Trusts Living Seas North West. Read on: the birdwatching calendar in more detail, seal watching, rock pooling.