Stoneflies
Gammarids
The Bibury beat is famously associated with Bibury Trout Farm and the village's chalk-stream identity. Mixed wild and stocked brown trout, grayling on some beats. Mostly private but Bibury area accessible via the trout farm structure.
- Limestone
Rules at a glance
- Fly only
Water temperature for Grayling
Ideal9°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Midday window — grayling feed best from late morning into early afternoon.
Where
Work runs and glides — grayling shoal in the bottom third of the water column.
Method
Tight-line nymph the bottom third with weighted patterns.
Kit
10 ft #3 rod, floating line, long leader to 4 lb fluoro for nymphs.
Why this works
Excellent — water temperature is right today, though time of day could be better. Grayling feeds actively in cold water — peak winter sport.
Likely species
Hatch timeline · tomorrowPeak at 12pm
12pm(now) — Autumn Olive
Stage: On emergersApproach: Emerger or dryActivity: 49%
Also:Autumn Needle Fly36%Black Midge32%
Peak emergence window5 food groups active
Peak activity at 12pm — Autumn Olive (Autumn Olive, Peak emergence window)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 4 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 3 as a supporter.
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 · November highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
1
Mayfly (Green Drake)Hatch
2
2
Freshwater ShrimpHatch
2
3
3
3
3
3
3
3
3
3
3
2
CapererHatch
2
3
3
2
Brown SedgeHatch
2
3
3
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Grayling fly box
The heartland of English dry fly fishing. Upstream dry fly and emerger presentation dominates. Nymphing restricted or discouraged on many beats. Gin-clear alkaline water, prolific weed growth, educated wild brown trout. Precise imitation and delicate presentation are paramount.
Permits & access
Permit required — see local rules.
- Bibury Trout Farm day tickets cover the famous beat
- Other beats syndicate.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
River Coln, Bibury Terrain map
About this water
Water quality (WFD)
- Ecology: Poor
Water quality details
- Dissolved oxygen: High
- Biochemical Oxygen Demand (BOD): High
- Ammonia (Phys-Chem): High
- pH: High
- Phosphate: Good
- Temperature: High
EA (England) · GB106039029992
The full read · show the working · for Grayling · confidence 75%
How the 81 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time50 × 13%6.5
Pressure80 × 7%5.6
Insect activity64 × 12%7.7
Conditions total= 81
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout 1 April → 30 September
Related guides
Casting instructors near here
Booking & contacts
Boards & regulators
River Coln
The Coln runs through some of the prettiest Cotswold villages — Withington, Fosse Bridge, Bibury, Fairford — to join the Thames near Lechlade.
Water temperature for Grayling
Ideal9°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Midday window — grayling feed best from late morning into early afternoon.
Where
Work runs and glides — grayling shoal in the bottom third of the water column.
Method
Tight-line nymph the bottom third with weighted patterns.
Kit
10 ft #3 rod, floating line, long leader to 4 lb fluoro for nymphs.
Why this works
Excellent — water temperature is right today, though time of day could be better. Grayling feeds actively in cold water — peak winter sport.
Likely species
Hatch timeline · tomorrowPeak at 12pm
12pm(now) — Autumn Olive
Stage: On emergersApproach: Emerger or dryActivity: 49%
Also:Autumn Needle Fly36%Black Midge32%
Peak emergence window5 food groups active
Peak activity at 12pm — Autumn Olive (Autumn Olive, Peak emergence window)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 4 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 3 as a supporter.
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 · November highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
1
Mayfly (Green Drake)Hatch
2
2
Freshwater ShrimpHatch
2
3
3
3
3
3
3
3
3
3
3
2
CapererHatch
2
3
3
2
Brown SedgeHatch
2
3
3
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Grayling fly box
The heartland of English dry fly fishing. Upstream dry fly and emerger presentation dominates. Nymphing restricted or discouraged on many beats. Gin-clear alkaline water, prolific weed growth, educated wild brown trout. Precise imitation and delicate presentation are paramount.
Permits & access
Permit required — see local rules.
- Bibury Trout Farm day tickets cover the famous beat
- Other beats syndicate.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
River Coln, Bibury Terrain map
About this water
The Bibury beat is famously associated with Bibury Trout Farm and the village's chalk-stream identity. Mixed wild and stocked brown trout, grayling on some beats. Mostly private but Bibury area accessible via the trout farm structure.
- Limestone
Water quality (WFD)
- Ecology: Poor
Water quality details
- Dissolved oxygen: High
- Biochemical Oxygen Demand (BOD): High
- Ammonia (Phys-Chem): High
- pH: High
- Phosphate: Good
- Temperature: High
EA (England) · GB106039029992
The full read · show the working · for Grayling · confidence 75%
How the 81 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time50 × 13%6.5
Pressure80 × 7%5.6
Insect activity64 × 12%7.7
Conditions total= 81
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout 1 April → 30 September
Related guides
Casting instructors near here
Booking & contacts
Boards & regulators
At a glance
River Coln is a chalk stream in Gloucestershire (Cotswolds), England. Its recorded elevation is about 101 m above sea level and the catchment geology is limestone. The river is described as roughly 40 km long. Our data lists brown trout and grayling here. The trout season is recorded as running from 1 April to 30 September. Best window recorded for anglers: April–June; mayfly late May; September. Core methods listed: dry fly; upstream nymph. Level and flow data for this water is linked from the gauge “Fosse Bridge (0630TH, upper) + Bibury (0660TH, famous beat) + Fairford (0680TH, lower) — Thames tributary”. Its Water Framework Directive ecological status is recorded as poor. Nearby waters in our listings include Great Burrows Trout Fishery at 1.0 km, Lechlade & Bushyleaze Trout Fisheries at 11 km and River Leach at 13 km.