Silver Creek Idaho Hatch Chart

South-central Idaho, near Sun Valley. Silver Creek is a classic spring creek - one of the most celebrated and technically demanding trout fisheries in the American West. Fed by constant-temperature springs, the creek maintains stable flows and temperatures year-round, producing exceptional aquatic insect populations and large, selective rainbow and brown trout.

The primary public fishery is managed through a partnership between The Nature Conservancy (which owns the preserve) and Idaho Fish and Game. The main stem below the Stalker Creek confluence is the focus of most fishing pressure. Fish average 14-18 inches with larger fish present throughout - but they are educated, and will refuse a fly that is one size too large or lands one inch off target.

Silver Creek demands the finest presentation skills in fly fishing: long leaders (12-16 feet), 6X or 7X tippet, accurate casting, and careful wading to avoid spooking fish. This is not a beginner river - but it rewards patience and precision with exceptional fish.

Check current Idaho Fish and Game regulations and Nature Conservancy preserve rules before you go. The preserve has specific access protocols, parking areas, and seasonal closures. A fishing license and Idaho Fish and Game validation are required.

Shop by type: dry flies, nymphs, Euro nymphs, hoppers and terrestrials, streamers.

Year at a glance

Month Primary hatches Also carry Typical sizes
Jan Midges BWO on mild days 20-24
Feb Midges, BWO Small stonefly nymphs 18-24
Mar Midges, BWO Early caddis on warm afternoons 18-22
Apr BWO, midges, caddis Early PMD, pale morning dun emergers 16-22
May PMD, caddis, BWO Pale evening dun, callibaetis PMD 16-18, caddis 14-16
Jun PMD, pale evening dun, callibaetis Caddis, BWO 16-18
Jul Tricos, callibaetis, pale evening dun Hoppers, caddis, PMD Trico 20-24, hopper 8-12
Aug Tricos, hoppers, callibaetis Ants, beetles, pale evening dun Trico 20-24, hopper 8-12
Sep Tricos, BWO, callibaetis Hoppers, mahogany dun Trico 20-24, BWO 18-22
Oct BWO, midges, mahogany dun Callibaetis, streamers 18-22
Nov Midges, BWO Small nymphs 20-24
Dec Midges BWO on mild days 20-24

January

Silver Creek fishes year-round. January midge activity can be exceptional on calm, sunny afternoons - spring creek fish stack in the flat pools and tailouts and sip midge clusters with maddening selectivity. The water is clear, the fish are visible, and the challenge is real.

  • Midges - 20-24. Two-fly midge rig - larva or pupa below, adult or cluster pattern on the surface. Fine tippet is non-negotiable. A red zebra midge subsurface with a small dry on top.
  • BWO - 20-22 on overcast afternoons. Parachute BWO when fish are visibly rising to olives.

February

Same midge and olive program. Olives increase on gray afternoons. One of the least-pressured months on the preserve - worth the visit if you can handle the cold and the challenge.

March

BWO hatches strengthen. Midges remain consistent. Early caddis on warmer afternoons late in the month. March is an excellent time - fish are active, crowds are minimal, and the hatches are manageable in size and complexity compared to summer.

April

Spring arrives. Caddis become more reliable. PMDs may begin by late April. The creek is stunning in April - waterfowl on the preserve, green coming into the meadows, and fish that have been sipping small flies all winter beginning to look up for larger patterns.

May

The complexity of Silver Creek hatches begins in earnest. PMDs and caddis overlap. Pale evening duns and callibaetis add more options. On a good May afternoon, you may have three or four insects on the water simultaneously - and the fish will be keyed to one of them. Observation before casting is essential.

  • PMD - 16-18. Pale Morning Dun mornings. A pheasant tail dropper covers the nymph stage.
  • Caddis - 14-16 afternoons and evenings. Elk hair.
  • BWO on overcast mornings.
  • Pale evening dun - 16-18 at dusk. Fish often feed most aggressively in the last 30 minutes of light.
  • Callibaetis - 14-16. A sparkle dun or parachute style in gray-olive.

June

Peak spring fishing. PMDs and pale evening duns dominate. Callibaetis are important on the slower pool sections. Crowds begin building - arrive early, pick your water carefully, and be prepared to wait out other anglers before approaching a rising fish. The evening PED hatch can produce the most intense surface feeding of the year.

  • PMD - 16-18. Pale Morning Dun with a pheasant tail dropper.
  • Pale evening dun - 16-18. Last light. Long leader, fine tippet, accurate cast - one chance per fish.
  • Callibaetis - 14-16. Parachute or sparkle dun in gray-olive on slow pool sections.
  • Evening caddis. Elk hair.

July

Trico season begins - the hatch Silver Creek is most famous for. Morning spinner falls bring every large fish in the preserve to the surface simultaneously, sipping size 20-24 spent flies in the flat, mirror-smooth pools. It is one of the most visually spectacular and technically demanding dry-fly situations in western trout fishing. Hoppers start along the meadow edges. Fish early; July afternoons on the preserve can be crowded.

  • Trico - 20-24. The signature hatch. Early morning spinner falls on flat water. Spent-wing pattern on 7X tippet, dead drift, minimal drag. Plan to be on the water at first light.
  • Callibaetis - 14-16 on the slow pool sections through midday.
  • Pale evening dun - 16-18 at last light.
  • Early hoppers along the meadow margins - hoppers and terrestrials.
  • Evening caddis. Elk hair.

August

Trico spinner falls continue and are often at their most reliable in August. Hoppers work the meadow banks and are one of the few patterns that can provoke a reaction strike from otherwise lock-jawed Silver Creek fish. Ants and beetles in the foam lines. Fish early - the preserve is busiest in August and the best fishing is in the first two hours of light.

  • Trico - 20-24. Morning spinner falls. The most important hatch of the month. 7X tippet, spent-wing pattern, precise cast.
  • Hoppers - 8-12. Meadow bank edges and grass undercuts. Shop hoppers and terrestrials. A hopper can move fish that nothing else will.
  • Ants and beetles in foam lines and surface film along grassy banks.
  • Callibaetis - 14-16 on the slow sections through midday.
  • Pale evening dun at last light.

September

Outstanding month. Tricos continue into mid-September. BWO return as nights cool. Callibaetis remain important. Hoppers hold through mid-month. Crowds drop sharply after Labor Day. The meadow turns gold, the mornings are cold and clear, and the fish are as large and selective as ever. One of the best months of the year to fish the preserve.

  • Tricos through mid-September on flat water.
  • Hoppers and ants through mid-month.
  • Mahogany dun - 14-16 on overcast afternoons.
  • Callibaetis - 14-16 on slow pool sections.

October

Fall BWO fishing is exceptional - dense hatches on gray afternoons, selective fish, and a nearly empty preserve. Mahogany duns add a second dry-fly option. Callibaetis taper off. The creek in October - waterfowl staging on the preserve ponds, frost on the meadow grass - is worth the trip for the scenery alone.

  • BWO - 18-22. The dominant hatch. Sparse patterns, fine tippet, accurate presentation.
  • Mahogany dun - 14-16 on overcast afternoons.
  • Midges - 20-24 in slow tailouts and pools.
  • Streamers in the deeper bends at last light.

November

Back to the midge and olive program. The preserve is quiet. Cold mornings, short days, and spring creek fish that have seen every pattern in the book - but willing to eat a well-presented midge on a calm afternoon.

  • Midges - 20-24. Two-fly rig through slow water and tailouts.
  • BWO on overcast afternoons, 18-22.
  • Small nymphs sized to 18-20.

December

Midge season. Silver Creek in December is serene and largely untouched. Fish are catchable on the right day. Mild, calm afternoons with overcast skies and no wind are the conditions to look for.

A Silver Creek box is built around small flies and precise presentation. Start with a deep midge selection in sizes 18-24, a strong BWO and trico assortment, PMDs, callibaetis, and pale evening dun patterns. Add hoppers for August and September. Go one tippet size finer than you think you need - 7X is standard, not unusual. The western dry and nymph assortment is a starting point - supplement with smaller sizes and spring-creek-specific patterns.