The Big Garden Birdwatch: How to Take Part (and Count Properly)

Updated 01 September 2026 · 7 min read

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There’s one counting rule that catches almost everybody out, and it’s worth understanding before you start: you record the highest number of each species seen at any one time — not the total number of visits.

The counting rule explained

This is where people go wrong, and it materially affects the data.

You record the maximum number of each species visible simultaneously.

So if a blue tit visits, leaves, and another (or the same one) returns eight times over the hour — you record 1, not 8. If at one moment you see three blue tits on the feeder together, you record 3.

The reason is straightforward: there’s no way to tell whether you’re seeing the same bird returning or different individuals. Counting simultaneous sightings avoids inflating the numbers.

What else to know

• Only count birds that land in your garden or space. Birds flying over don’t count — a passing gull or a heron overhead isn’t a garden visitor
• Count birds in the garden itself, not those on a neighbour’s roof or in the street
• Birds in trees or on fences within your garden do count — they don’t need to be at the feeder
• Record zero counts too. If you see no house sparrows, that’s genuinely useful data. The survey’s value comes partly from absences

Why it matters

This isn’t just a pleasant hour. The Birdwatch has been running since 1979 and now represents one of the longest continuous datasets on UK garden birds anywhere.

Its findings have driven real conclusions. The greenfinch decline — down around 67% since the survey began, over two million birds, now on the UK Red List — was tracked substantially through this data, and that evidence contributed to the RSPB’s 2026 change in feeding guidance. House sparrow and starling declines have been similarly documented.

A single hour from one garden is a small contribution. Hundreds of thousands of them is a national picture nobody could gather any other way.

Preparing in the weeks beforehand

Not about attracting unusual birds for the day — it’s about making your garden a place birds already use, so the count reflects something real.

Start two to three weeks ahead. Birds need time to establish a feeding routine.

• Feed consistently. January falls inside the 1 November to 30 April window when seeds and peanuts are recommended, so the full range is available
• Offer variety — sunflower hearts, suet, peanuts in a mesh feeder, nyjer if you’re after goldfinches. Different foods bring different species
• Add a second or third feeder, spaced apart. This reduces crowding and increases the range of birds using the garden at once
• Provide water — often scarce in a January frost, and changed daily with fresh tap water
• Clean feeders weekly and move them to a fresh spot each time. Birds avoid dirty feeders, and hygiene matters most when feeders are busiest
• Leave seed heads standing if you have them — finches feed on them through winter

Choosing your hour

You can count at any point across the weekend. A few things genuinely help:

• Early morning is usually busiest — birds feed heavily after a long, cold night
• Mid-afternoon is a decent second choice, as birds feed up before roosting
• Avoid gusty or heavy rain if you can choose. Birds shelter and activity drops
• Watch from indoors. A window is the best hide you own, and your presence outside will keep birds away
• Top up feeders the evening before, not during the hour

What you’ll likely see

Based on recent Birdwatch results, the most commonly recorded species are house sparrow, blue tit, starling, woodpigeon and blackbird, followed by great tit, robin, goldfinch, magpie and long-tailed tit.

January is also when winter visitors turn up — redwings and fieldfares (Scandinavian thrushes, often drawn to windfall fruit in hard weather), bramblings (chaffinch-like, with an orange breast and white rump), and blackcaps, which increasingly overwinter in UK gardens.

Our identification guide covers all of these, and the brown bird guide handles the harder ones.

If you’re not sure what you saw

Perfectly normal, and it doesn’t disqualify you.

• Only record what you’re confident about. A wrong identification is worse for the data than an omission
• Note details — size, bill shape, behaviour, markings — and identify afterwards
• Take a photo if you can, even a poor one
• The Merlin Bird ID app handles UK species well and can identify birds from sound
• The RSPB provides a counting sheet with the common species illustrated, which is genuinely helpful if you’re new to it

Submitting your count

Register on the RSPB website beforehand, then submit online after your hour. Results are usually submitted within a couple of weeks of the weekend — check the current deadline on their site.

National results are typically published a few months later, and comparing your own garden against them year on year becomes surprisingly interesting.

Common questions

Related guides

• Common garden birds in the UK: how to identify your visitors
• Best bird food for winter: what to put out and what to skip
• Best binoculars for garden birdwatching
• When to feed garden birds: the new UK guidance explained

Sources: RSPB Big Garden Birdwatch guidance and published results; RSPB feeding guidance (April 2026). Dates and submission details change annually — confirm on the RSPB website.