Rules at a glance
- Free fishing
- Fly only
Water temperature for Brown Trout
Ideal14°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Through the Castilla y León trout season — 3rd Sunday of March to 31 July. Spring olives April through May; summer sedges in evening hours; sin muerte stretches extend through autumn.
Where
Pool tails, riffle heads, and the seams behind boulders through the Segovian beats. The Eresma runs from the Sierra de Guadarrama through clear granite pocket water.
Method
Upstream dry to risers; dry-dropper through the riffles. The water reads clear — long leader, fine tippet, careful approach.
Kit
9 ft #4 — Castilian default. Floating line, 12 ft leader to 4 lb fluoro. Studded boots — granite cobble runs slick.
Hatch timeline · todayPeak at 6pm
12pm(now) — Cinnamon Sedge
Stage: Taking dunsApproach: Dry flyActivity: 32%
Also:Reed Smut21%
5 food groups active
Peak activity at 6pm — Evening Sedge (Evening Sedge, 7 food groups active)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 3 guilds 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
1
Large Dark OliveHatch
1
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Autumn OliveHatch
1
2
1
Brown SedgeHatch
1
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
Permits & access
Permit required — see local rules.
- Se requiere licencia de Castilla y León
- El tramo Valsaín–La Granja es la identidad de trucha salvaje del río; los tramos bajos urbanos y agrícolas siguen una gestión distinta (a menudo de repoblación)
- Ajusta el tramo a tu objetivo antes de reservar.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity48 × 12%5.8
Conditions total= 82
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 Last Sunday of March → 31 July
Related guides
Booking & contacts
Río Eresma
Water temperature for Brown Trout
Ideal14°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Through the Castilla y León trout season — 3rd Sunday of March to 31 July. Spring olives April through May; summer sedges in evening hours; sin muerte stretches extend through autumn.
Where
Pool tails, riffle heads, and the seams behind boulders through the Segovian beats. The Eresma runs from the Sierra de Guadarrama through clear granite pocket water.
Method
Upstream dry to risers; dry-dropper through the riffles. The water reads clear — long leader, fine tippet, careful approach.
Kit
9 ft #4 — Castilian default. Floating line, 12 ft leader to 4 lb fluoro. Studded boots — granite cobble runs slick.
Hatch timeline · todayPeak at 6pm
12pm(now) — Cinnamon Sedge
Stage: Taking dunsApproach: Dry flyActivity: 32%
Also:Reed Smut21%
5 food groups active
Peak activity at 6pm — Evening Sedge (Evening Sedge, 7 food groups active)
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 3 guilds 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
1
Large Dark OliveHatch
1
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Autumn OliveHatch
1
2
1
Brown SedgeHatch
1
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Brown Trout fly box
Permits & access
Permit required — see local rules.
- Se requiere licencia de Castilla y León
- El tramo Valsaín–La Granja es la identidad de trucha salvaje del río; los tramos bajos urbanos y agrícolas siguen una gestión distinta (a menudo de repoblación)
- Ajusta el tramo a tu objetivo antes de reservar.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time60 × 13%7.8
Pressure80 × 7%5.6
Insect activity48 × 12%5.8
Conditions total= 82
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 Last Sunday of March → 31 July
Related guides
Booking & contacts