st-joe

St. Joe River is a river in Idaho.

It ranks #11 among the 28 waters of Idaho in the registry, and is of regional prominence.

Its official name is Saint Joe River.

Also called The Joe and St. Joe.

Fished for trout (inferred from the species listed).

Species: cutthroat trout, bull trout and rainbow trout.

USGS GNIS record: 389832.

Stretches: Lower St. Joe and Upper St. Joe.

Confluences: Marble Creek.

Features: Avery and Calder.

North Fork of the St. Joe (confluence). It is fishable. Runs about 30 miles north from Avery per a 2008 fly column; single-hook artificial-fly rules apply from Avery upstream and on the North Fork. Single source, 2008.

Sourced from 5 independent fly sites.

Sources: cdn.orvis.com (retrieved 2026-10-20), fishingreports.orvis.com, fliesidaho.com (retrieved 2026-10-20), flylordsmag.com (retrieved 2026-10-20), northwestfishingreports.com (retrieved 2026-10-20), riverdancelodge.com (retrieved 2026-10-20), The Fly Fishing Place (retrieved 2026-10-20), Whitepine Outfitters (retrieved 2026-10-20), Whitepine Outfitters (2) (retrieved 2026-10-20), Whitepine Outfitters (3) (retrieved 2026-10-20), Whitepine Outfitters (4) (retrieved 2026-10-20), Whitepine Outfitters (5) (retrieved 2026-10-20) and Whitepine Outfitters (6) (retrieved 2026-10-20).

Hatches

Salmonfly

Stage: adult. Sourced.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May hatching
  6. Jun hatching
  7. Jul
  8. Aug
  9. Sep
  10. Oct
  11. Nov
  12. Dec

Expected 'soon' on 24 April 2025, on the water by 15 May 2025 (chubby plus tungsten nymph recommended). A hatch-chart page puts it in June (early on the lower river); timing varies with runoff.

Sources: The Fly Fishing Place, Whitepine Outfitters, Whitepine Outfitters

March brown

Stage: dun, emerger. Sourced.

  1. Jan
  2. Feb
  3. Mar
  4. Apr hatching
  5. May hatching
  6. Jun hatching
  7. Jul
  8. Aug
  9. Sep
  10. Oct
  11. Nov
  12. Dec

Dry action peaks 1-2 pm in late April (24 April 2025 report); soft hackles two feet down recommended on 1 May; still listed as a main hatch on 5 June 2025.

Sources: Whitepine Outfitters, Whitepine Outfitters, Whitepine Outfitters, Whitepine Outfitters

Skwala

Stage: adult, nymph. Sourced.

  1. Jan
  2. Feb
  3. Mar
  4. Apr hatching
  5. May hatching
  6. Jun
  7. Jul
  8. Aug
  9. Sep
  10. Oct
  11. Nov
  12. Dec

White Pine Outfitters reports skwalas from mid-April (17 and 24 April 2025) and still worth prospecting on 1 May; Flylords' Idaho guide calls them a spring hatch. A hatch-chart page says March-April.

Sources: Whitepine Outfitters, The Fly Fishing Place, Whitepine Outfitters, flylordsmag.com

October caddis

Stage: adult. Well sourced.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun
  7. Jul
  8. Aug
  9. Sep hatching
  10. Oct hatching
  11. Nov
  12. Dec

First few seen on 12 September 2026; Flylords' guide places it in late summer to early fall; a chart page says Sep-Oct.

Sources: The Fly Fishing Place, Whitepine Outfitters, flylordsmag.com

Ants and beetles

Stage: terrestrial. Sourced.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun
  7. Jul
  8. Aug hatching
  9. Sep hatching
  10. Oct
  11. Nov
  12. Dec

Small ants in the 27 August 2026 report; heavy ant activity and beetles on 12 September 2026.

Sources: Whitepine Outfitters, Whitepine Outfitters

Golden stonefly

Stage: adult. Sourced.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May hatching
  6. Jun hatching
  7. Jul
  8. Aug
  9. Sep
  10. Oct
  11. Nov
  12. Dec

Listed by White Pine Outfitters on 15 May 2025 and as 'golden stone time' on 5 June 2025 (hopper-dropper with a size 10-12 chubby).

Sources: Whitepine Outfitters, flylordsmag.com, Whitepine Outfitters

Grasshoppers

Stage: terrestrial. Sourced.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun
  7. Jul
  8. Aug hatching
  9. Sep hatching
  10. Oct
  11. Nov
  12. Dec

Foam hoppers in the 13 and 27 August 2026 reports; grasshoppers still listed 12 September 2026.

Sources: Whitepine Outfitters, Whitepine Outfitters

Mahogany dun and blue-winged olive (fall)

Stage: dun. Sourced.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun
  7. Jul
  8. Aug
  9. Sep hatching
  10. Oct
  11. Nov
  12. Dec

Both named in the 12 September 2026 report; Flylords lists olives in spring and fall.

Sources: Whitepine Outfitters, flylordsmag.com

Yellow sally

Stage: adult. Sourced.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun hatching
  7. Jul hatching
  8. Aug
  9. Sep
  10. Oct
  11. Nov
  12. Dec

Flagged as arriving soon on 15 May 2025 and a main hatch on 5 June 2025; a chart page carries it into July.

Sources: The Fly Fishing Place, Whitepine Outfitters, Whitepine Outfitters

Caddis

Stage: adult. Single or templated source.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May hatching
  6. Jun
  7. Jul
  8. Aug
  9. Sep hatching
  10. Oct
  11. Nov
  12. Dec

Listed in the 15 May 2025 report and again in the 12 September 2026 report; a chart page extends caddis from March through August. Sparse month evidence, so only observed months are given.

Sources: The Fly Fishing Place, Whitepine Outfitters, Whitepine Outfitters

Also named, timing not yet researched: Pale morning dun / green drake (early-summer mayflies), Gray drake.

Access, closures and rules change; check with the state agency before you go.