Spring is the most exciting time to be on a UK river. Hatches are starting, trout are moving, and the whole season stretches ahead. Get the right flies in your box and you will hit the ground running from opening day.
Here are the 7 best flies for spring trout fishing on UK rivers, when to use each one, and where to buy them.
Table of Contents
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📅 Quick Reference — Spring Fly Guide
| Fly | Best Month | Method | Target |
|---|---|---|---|
| Large Dark Olive | March to April | Dry fly | Brown trout |
| Tungsten Pheasant Tail | March to June | Nymph | Trout and grayling |
| Hare’s Ear Jig | March to May | Nymph | Trout |
| Soft Hackle Spider | April to June | Wet fly swing | Trout and grayling |
| CDC Dry | April to June | Dry fly | Brown trout |
| UV Perdigon | March to May | Euro-nymph | Trout |
| Elk Hair Caddis | May to June | Dry fly | Brown trout |
🫒 1. Large Dark Olive – “The Opening Day Fly”
The Large Dark Olive (LDO) is the first significant hatch of the UK river season. It starts emerging from late February on milder rivers and becomes reliable through March and April. When you see these dark, upright-winged flies drifting on the surface, trout will be looking up for them.Why it works
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- Matches the first major hatch of the season
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- Trout key in on LDOs quickly after a winter of nymphing
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- Size 14 covers most UK river hatches accurately
Fish it
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- On a long, fine leader with a drag-free drift
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- In slow glides during the afternoon hatch window
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- Size 14 in March, dropping to size 16 as the season progresses
Best conditions
✔ Overcast mild afternoons ✔ Water temperature above 7°C ✔ Calm, flat glides Recommended: 👉 Barbless CDC Dry Flies on Troutflies.co.uk🟣 2. Tungsten Pheasant Tail Nymph – “The Spring Workhorse”
When the surface is quiet and trout are not showing, the Tungsten Pheasant Tail is your best option. It imitates olive nymphs, baetis, and a range of natural food sources that are active from the very first week of the season.Why it works
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- Slim, natural profile trout recognise instantly
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- Tungsten bead gets it into the feeding zone fast
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- Consistent producer from March all the way through summer
Fish it
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- As your point fly on a two-nymph rig
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- Euro-nymphing style in deeper runs and pools
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- Under an indicator in slower water
Best conditions
✔ All spring conditions ✔ Clear to slightly coloured water ✔ Pools, runs, and tail-outs Recommended: 👉 Tungsten Nymph Trout Flies on Troutflies.co.uk 👉 Tungsten Winter Nymph Pack on Amazon🟤 3. Hare’s Ear Jig Nymph – “The Natural”
If trout are being selective and refusing your other nymphs, switch to the Hare’s Ear. Its scruffy, buggy texture looks like almost every natural food item a spring trout encounters. It is the confidence fly that saves blank days.Why it works
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- Imitates olives, shrimps, and general nymphs all at once
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- The jig hook rides point-up, reducing snags on the riverbed
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- Works beautifully in clear, cold spring water
Fish it
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- In shallow riffles on ultra-light tippet
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- As a dropper above a heavier anchor fly
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- With a slow, natural drift through feeding lanes
Best conditions
✔ Clear spring water ✔ Pressured beats where fish have seen everything ✔ Midday warmth Recommended: 👉 Barbless Hare’s Ear Jig Flies on Troutflies.co.uk🕸️ 4. Soft Hackle Spider – “The Spring Swing”
The Spider comes into its own in spring when emerging insects are swimming up through the water column. Fished on the swing, it imitates a hatching nymph perfectly — and the takes are often aggressive.Why it works
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- Soft hackle fibres breathe and pulse in the current
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- The swing imitates an emerging insect swimming to the surface
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- Simple to fish — great for beginners and experienced anglers alike
Fish it
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- Cast across and slightly downstream
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- Let it swing naturally across the current on a tight line
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- Hold the rod low and wait for the pull
Best conditions
✔ During or just before a hatch ✔ Smooth, even-flowing runs ✔ Mild April and May afternoons Recommended: 👉 Soft Hackle Fly Pack on Amazon🪶 5. CDC Dry Fly – “The Surface Trigger”
Once water temperatures climb above 10°C and hatches become regular, a CDC dry fly is the most satisfying way to catch spring trout. The cul de canard feather floats naturally without floatant and sits beautifully flush in the surface film.Why it works
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- Floats flush in the surface film like a natural emerger
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- Very little disturbance on the water
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- Matches olive and midge hatches that dominate spring
Fish it
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- On a long leader with a fine tippet (6X)
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- To rising fish — cast upstream and let it drift over the rise
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- In calm, flat glides during afternoon hatches
Best conditions
✔ Visible rises ✔ Calm afternoons from April onwards ✔ Clear, slow-moving water Recommended: 👉 Barbless CDC Dry Flies on Troutflies.co.uk✨ 6. UV Perdigon – “The Fast Water Hunter”
Spring rivers often run high and fast after winter rain. The UV Perdigon cuts through the water column faster than any other nymph, getting down to where fish are holding in heavy flows. The UV body catches the light even in coloured water.Why it works
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- Ultra-slim body sinks faster than traditional nymphs
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- UV finish attracts in low light and coloured water
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- Perfect anchor fly on a Euro-nymph rig
Fish it
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- Tight line or Euro-nymphing style
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- In deeper pools and fast runs after rain
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- As your lead fly with a lighter nymph on the dropper
Best conditions
✔ High or coloured water ✔ Fast runs and deep pockets ✔ Early season when rivers are full Recommended: 👉 UV Diawl Bach Nymph on Troutflies.co.uk 👉 Tungsten Nymph Selection on Amazon🦟 7. Elk Hair Caddis – “The May Fly Killer”
From mid-May onwards, sedge flies start hatching on most UK rivers. The Elk Hair Caddis is one of the most reliable dry flies ever tied — its buoyant elk hair wing sits high on the water and is visible even in broken surface currents.Why it works
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- Elk hair is naturally buoyant and highly visible
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- Imitates sedge and caddis flies perfectly
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- Works in broken water where CDC dries sink
Fish it
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- Cast across and let it drift drag-free
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- Try a small skate or twitch to imitate a moving sedge
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- Fish it at dusk when sedge hatches peak
Best conditions
✔ May and June evenings ✔ Riffles and broken water ✔ When you see tent-wing flies on the surface Recommended: 👉 Barbless CDC and Dry Fly Pack on Troutflies.co.uk🛒 Where to Buy Spring Flies
Most UK anglers buy ready-tied fly packs rather than tying their own — it saves time and you know the patterns are correct. From Troutflies.co.uk (UK specialist): ✔ Tungsten Nymph Trout Flies ✔ Barbless Hare’s Ear Jig Flies ✔ UV Diawl Bach Nymph ✔ Barbless CDC Dry Flies From Amazon UK: ✔ Tungsten Nymph Pack ✔ Soft Hackle Fly Pack ✔ Waterproof Fly BoxRelated Guides
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