- Ecology: Moderate
- Chemical: Unknown
EA (England) · UKGB104027064258
Water temperature for Brown Trout
Warm — slow23°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Olives off through afternoon hatches April through May; Mayfly into early June where it shows; sedges through summer; small dark flies into early October.
Where
Pool tails, the heads of riffles, and the seams behind boulders. The Wharfe fishes pocket-to-pocket — read the water mark by mark.
Method
Upstream dry to risers when olives or sedges are off; North Country spider on the swing in cooler water — Snipe and Purple, Partridge and Orange, Waterhen Bloa. Move upstream slowly, fish each lie properly.
Kit
9 ft #4 — Yorkshire freestone default. Floating line, 9 to 12 ft leader to 4 to 5 lb fluoro. Studded boots for slick stones.
Why this works
Water at 22.9°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayPeak at 6am
Hatch predictions
Today's headline hatch shown — see all 9 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
Top prey shown — see all 2 with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
Grayling seasonSeason
2
2
1
1
2
2
2
2
2
2
Daddy Long LegsHatch
2
3
2
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
North Country spider water
Local classics: Waterhen Bloa·Snipe & Purple·Partridge & Orange
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 2
Probably above the Brown Trout safety line — these are likely cooler, but carry a thermometer.
Gallery · 6
River Wharfe at Bolton Abbey 
River Wharfe in Kettlewell 
The River Wharfe near Appletreewick 
Bolton Abbey — River Wharfe 
Linton Falls, River Wharfe, near Grassington Terrain map
Water quality (WFD)
The full read · show the working · for Brown Trout · confidence 90%
How the 4 is built — score × weight = contribution
Temperature2 × 28%0.6
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity54 × 12%6.5
Limiting factor: Water temperature (22.9°C) is outside Brown Trout's preferred range (10–16°C)= 57
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
Directions
Seasons & zones
- Trout 22 March → 30 September
- Grayling 16 June → 14 March
Bolton Abbey and Ilkley AA both list grayling 16 June – 14 March. Fly only on most beats, barbless/de-barbed, all grayling returned. Best fishing is autumn — September through December. Check the specific beat or association for day-ticket availability.
Prime sport 1 September → 31 December
Related guides
Casting instructors near here
Booking & contacts
River Wharfe
Water temperature for Brown Trout
Warm — slow23°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Olives off through afternoon hatches April through May; Mayfly into early June where it shows; sedges through summer; small dark flies into early October.
Where
Pool tails, the heads of riffles, and the seams behind boulders. The Wharfe fishes pocket-to-pocket — read the water mark by mark.
Method
Upstream dry to risers when olives or sedges are off; North Country spider on the swing in cooler water — Snipe and Purple, Partridge and Orange, Waterhen Bloa. Move upstream slowly, fish each lie properly.
Kit
9 ft #4 — Yorkshire freestone default. Floating line, 9 to 12 ft leader to 4 to 5 lb fluoro. Studded boots for slick stones.
Why this works
Water at 22.9°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayPeak at 6am
Hatch predictions
Today's headline hatch shown — see all 9 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
Top prey shown — see all 2 with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
1
Grayling seasonSeason
2
2
1
1
2
2
2
2
2
2
Daddy Long LegsHatch
2
3
2
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
North Country spider water
Local classics: Waterhen Bloa·Snipe & Purple·Partridge & Orange
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 2
Probably above the Brown Trout safety line — these are likely cooler, but carry a thermometer.
Gallery · 6
River Wharfe at Bolton Abbey River Wharfe in Kettlewell The River Wharfe near Appletreewick Bolton Abbey — River Wharfe Linton Falls, River Wharfe, near Grassington Terrain map
Water quality (WFD)
- Ecology: Moderate
- Chemical: Unknown
EA (England) · UKGB104027064258
The full read · show the working · for Brown Trout · confidence 90%
How the 4 is built — score × weight = contribution
Temperature2 × 28%0.6
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity54 × 12%6.5
Limiting factor: Water temperature (22.9°C) is outside Brown Trout's preferred range (10–16°C)= 57
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
Directions
Seasons & zones
- Trout 22 March → 30 September
- Grayling 16 June → 14 March
Bolton Abbey and Ilkley AA both list grayling 16 June – 14 March. Fly only on most beats, barbless/de-barbed, all grayling returned. Best fishing is autumn — September through December. Check the specific beat or association for day-ticket availability.
Prime sport 1 September → 31 December
Related guides
Casting instructors near here
Booking & contacts