Road course · California, USA
Sonoma Raceway
Sonoma Raceway is a road course in California. OpenStreetMap maps 5 layouts here, the longest 2.57 mi (4.13 km). Below: the map, every corner with a computed line, the elevation, and where to stay and eat.
- 2.56
- Miles
- 20
- Corners
- 157
- Ft of elevation
01Track map
Sonoma track map
Sonoma SRO
Layout name from an OpenStreetMap circuit relation.
- Mapped length
- 2.57mi
- 4.13 km
- Direction
- Clockwise
- From OSM one-way tagging.
- Start/finish line
- Estimated
- Estimated by TRACK from the mapped geometry and not verified on site. TRACK asks you to confirm or move it before timing laps here, when you’re stopped.
- Corners
- 21
- Inferred from curvature, not official turn numbers
- Sectors
- 3
- Estimated, near each third of the lap
Source geometry: OpenStreetMap ↗. Something wrong? Fixing it in OpenStreetMap improves it for everyone.
02Overview
What Sonoma is like to drive.
The sonoma sro layout at Sonoma is 2.56 miles with 20 corners worth setting up for and about 157 ft of elevation change. A generic track-day car in our model brakes hard 15 times a lap and is at full throttle for about 35% of the distance; the longest straight runs roughly 968 ft.
7 of the corners are slow (under 50 mph in the model), 8 are fast (over 75 mph). There are hairpins where exit speed matters more than entry. Some apexes sit on crests, where the car goes light. The corner notes below come from the mapped geometry, not from local knowledge; we’ll add a researched guide for Sonoma later.
03Lap at a glance
Where the speed is, and where the hills are.
- Length
- 2.56mi
- Elevation range
- 157ft
- Steepest grade
- 15%
- Braking zones
- 15model
- Full throttle
- 35% model
- Longest straight
- 968ft
The speed trace is a model, not a real lap: a generic track-day car (about 1.1 g of cornering grip, 1 g braking, 150 W/kg) driven on the computed line through an assumed 12 m wide track. Use it to see where the braking zones and flat-out sections are, not to predict your speeds. Elevation: USGS 3DEP 1/3 arc-second (NED 10 m) via OpenTopoData, sampled every 25 m along the mapped centerline.
04Corner by corner
The corners at Sonoma.
TRACK’s own corner numbering (C1, C2…), found from the curvature of the mapped centerline. It isn’t the official turn numbering. Each diagram shows the computed line: the minimum-curvature path through an assumed 12 m wide track. It’s a geometric starting point. Your instructor’s line comes first.
- C1
Fast left-hander
↰ LeftfastcornerTRACK numbering
A fast left-hand corner that turns about 34°, tightening to a radius of roughly 67 m (220 ft). The model car barely brakes here, carrying about 89 mph: a lift or a confident throttle balance. The computed line turns in from the right side, takes a late apex, about 5 m after the corner’s geometric apex, and lets the car run out to the right on exit.
- Turns
- 34° left
- Tightest radius
- 67 m
- Model speed
- ≈ 89 mph
- Braking (model)
- Lift / none
- Grade
- +0.4%
- C2
Fast left-hander
↰ LeftfastessesTRACK numbering
A fast left-hand esses that turns about 39°, tightening to a radius of roughly 54 m (177 ft). The model car brakes for about 80 m (262 ft), from 114 to 92 mph. The computed line turns in from the right side, takes a late apex, about 5 m after the corner’s geometric apex, and lets the car run out to the right on exit.
- Turns
- 39° left
- Tightest radius
- 54 m
- Model speed
- 114 → 92 mph
- Braking (model)
- 80 m
- Grade
- +1.3%
- C3
Fast right-hander
↱ RightfastchicaneTRACK numbering
A fast right-hand chicane that turns about 94°, tightening to a radius of roughly 34 m (112 ft). It climbs through the corner (about 8% grade). The model car brakes for about 50 m (164 ft), from 102 to 85 mph. The computed line turns in from the left side, takes an early apex, about 60 m before the geometric apex, and lets the car run out to the left on exit.
- Turns
- 94° right
- Tightest radius
- 34 m
- Model speed
- 102 → 85 mph
- Braking (model)
- 50 m
- Grade
- +7.5%
- C4
Medium right-hander
↱ RightmediumcornerTRACK numbering
A medium right-hand corner that turns about 99°, tightening to a radius of roughly 34 m (112 ft). It climbs through the corner (about 10% grade). The model car brakes for about 60 m (197 ft), from 88 to 57 mph. The computed line turns in from the left side, takes an apex close to the geometric apex, and lets the car run out to the left on exit.
- Turns
- 99° right
- Tightest radius
- 34 m
- Model speed
- 88 → 57 mph
- Braking (model)
- 60 m
- Grade
- +9.6%
- C5
Medium left-hander
↰ LeftmediumkinkTRACK numbering
A medium left-hand kink that turns about 9°, tightening to a radius of roughly 61 m (200 ft). The apex sits on a crest, so expect the car to go light. The model car brakes for about 65 m (213 ft), from 95 to 64 mph. The computed line turns in from the right side, takes a late apex, about 80 m after the corner’s geometric apex, and lets the car run out to the right on exit.
- Turns
- 9° left
- Tightest radius
- 61 m
- Model speed
- 95 → 64 mph
- Braking (model)
- 65 m
- Grade
- +1.4% · crest
- C6
Medium right-hander
↱ RightmediumchicaneTRACK numbering
A medium right-hand chicane that turns about 90°, tightening to a radius of roughly 30 m (98 ft). The model car brakes for about 50 m (164 ft), from 95 to 70 mph. The computed line turns in from the left side, takes an early apex, about 85 m before the geometric apex, and lets the car run out to the left on exit.
- Turns
- 90° right
- Tightest radius
- 30 m
- Model speed
- 95 → 70 mph
- Braking (model)
- 50 m
- Grade
- -0.7%
- C7
Medium right-hander
↱ RightmediumcornerTRACK numbering
A medium right-hand corner that turns about 62°, tightening to a radius of roughly 28 m (92 ft). It climbs through the corner (about 7% grade) and goes over a crest, so the car goes light at the apex. The model car brakes for about 35 m (115 ft), from 73 to 60 mph. The computed line turns in from the left side, takes an early apex, about 5 m before the geometric apex, and lets the car run out to the left on exit.
- Turns
- 62° right
- Tightest radius
- 28 m
- Model speed
- 73 → 60 mph
- Braking (model)
- 35 m
- Grade
- +6.5% · crest
- C8
Slow right-hander
↱ RightslowcornerTRACK numbering
A slow right-hand corner that turns about 109°, tightening to a radius of roughly 19 m (62 ft). It drops through the corner (about 9% grade). The model car barely brakes here, carrying about 44 mph: a lift or a confident throttle balance. The computed line turns in from the left side, takes an apex close to the geometric apex, and lets the car run out to the left on exit.
- Turns
- 109° right
- Tightest radius
- 19 m
- Model speed
- ≈ 44 mph
- Braking (model)
- Lift / none
- Grade
- -9.1%
- C9
Fast right-hander
↱ RightfastessesTRACK numbering
A fast right-hand esses that turns about 71°, tightening to a radius of roughly 73 m (240 ft). The model car barely brakes here, carrying about 76 mph: a lift or a confident throttle balance. The computed line turns in from the left side, takes a late apex, about 185 m after the corner’s geometric apex, and lets the car run out to the left on exit.
- Turns
- 71° right
- Tightest radius
- 73 m
- Model speed
- ≈ 76 mph
- Braking (model)
- Lift / none
- Grade
- -1.1%
- C10
Medium left-hander
↰ LeftmediumessesTRACK numbering
A medium left-hand esses that turns about 199°, tightening to a radius of roughly 48 m (157 ft). It drops through the corner (about 5% grade) and goes over a crest, so the car goes light at the apex. The model car barely brakes here, carrying about 65 mph: a lift or a confident throttle balance. The computed line turns in from the right side, takes an early apex, about 110 m before the geometric apex, and lets the car run out to the right on exit.
- Turns
- 199° left
- Tightest radius
- 48 m
- Model speed
- ≈ 65 mph
- Braking (model)
- Lift / none
- Grade
- -5.3% · crest
- C11
Slow right-hander
↱ RightslowcornerTRACK numbering
A slow right-hand corner that turns about 98°, tightening to a radius of roughly 7 m (23 ft). The model car brakes for about 135 m (443 ft), from 113 to 34 mph. The computed line turns in from the left side, takes an early apex, about 5 m before the geometric apex, and lets the car run out to the left on exit.
- Turns
- 98° right
- Tightest radius
- 7 m
- Model speed
- 113 → 34 mph
- Braking (model)
- 135 m
- Grade
- +1.3%
- C12
Slow right-hander
↱ RightslowcornerTRACK numbering
A slow right-hand corner that turns about 98°, tightening to a radius of roughly 20 m (66 ft). The model car brakes for about 50 m (164 ft), from 64 to 40 mph. The computed line turns in from the left side, takes an apex close to the geometric apex, and lets the car run out to the left on exit.
- Turns
- 98° right
- Tightest radius
- 20 m
- Model speed
- 64 → 40 mph
- Braking (model)
- 50 m
- Grade
- -1.6%
- C13
Fast right-hander
↱ RightfastchicaneTRACK numbering
A fast right-hand chicane that turns about 99°, tightening to a radius of roughly 38 m (125 ft). It drops through the corner (about 4% grade). The model car brakes for about 30 m (98 ft), from 94 to 81 mph. The computed line turns in from the left side, takes a late apex, about 145 m after the corner’s geometric apex, and lets the car run out to the left on exit.
- Turns
- 99° right
- Tightest radius
- 38 m
- Model speed
- 94 → 81 mph
- Braking (model)
- 30 m
- Grade
- -3.7%
- C14
Fast right-hander
↱ RightfastchicaneTRACK numbering
A fast right-hand chicane that turns about 76°, tightening to a radius of roughly 47 m (154 ft). It drops through the corner (about 4% grade). The model car brakes for about 30 m (98 ft), from 94 to 81 mph. The computed line turns in from the left side, takes an apex close to the geometric apex, and lets the car run out to the left on exit.
- Turns
- 76° right
- Tightest radius
- 47 m
- Model speed
- 94 → 81 mph
- Braking (model)
- 30 m
- Grade
- -3.7%
- C15
Fast left-hander
↰ LeftfastchicaneTRACK numbering
A fast left-hand chicane that turns about 82°, tightening to a radius of roughly 59 m (194 ft). It drops through the corner (about 3% grade). The model car brakes for about 55 m (180 ft), from 94 to 78 mph. The computed line turns in from the right side, takes a late apex, about 25 m after the corner’s geometric apex, and lets the car run out to the right on exit.
- Turns
- 82° left
- Tightest radius
- 59 m
- Model speed
- 94 → 78 mph
- Braking (model)
- 55 m
- Grade
- -3.4%
- C16
Fast right-hander
↱ RightfastessesTRACK numbering
A fast right-hand esses that turns about 35°, tightening to a radius of roughly 70 m (230 ft). It drops through the corner (about 2% grade). The model car barely brakes here, carrying about 78 mph: a lift or a confident throttle balance. The computed line turns in from the left side, takes an early apex, about 5 m before the geometric apex, and lets the car run out to the left on exit.
- Turns
- 35° right
- Tightest radius
- 70 m
- Model speed
- ≈ 78 mph
- Braking (model)
- Lift / none
- Grade
- -2.4%
- C17
Slow right-hander
↱ RightslowchicaneTRACK numbering
A slow right-hand chicane that turns about 192°, tightening to a radius of roughly 12 m (39 ft). The model car brakes for about 135 m (443 ft), from 113 to 41 mph. The computed line turns in from the left side, takes an early apex, about 5 m before the geometric apex, and lets the car run out to the left on exit.
- Turns
- 192° right
- Tightest radius
- 12 m
- Model speed
- 113 → 41 mph
- Braking (model)
- 135 m
- Grade
- -1.1%
- C18
Slow right-hander
↱ RightslowchicaneTRACK numbering
A slow right-hand chicane that turns about 201°, tightening to a radius of roughly 12 m (39 ft). The model car brakes for about 20 m (66 ft), from 47 to 38 mph. The computed line turns in from the left side, takes a late apex, about 105 m after the corner’s geometric apex, and lets the car run out to the left on exit.
- Turns
- 201° right
- Tightest radius
- 12 m
- Model speed
- 47 → 38 mph
- Braking (model)
- 20 m
- Grade
- -1.4%
- C19
Slow right-hander
↱ RightslowcornerTRACK numbering
A slow right-hand corner that turns about 63°, tightening to a radius of roughly 71 m (233 ft). The model car brakes for about 20 m (66 ft), from 47 to 38 mph. The computed line turns in from the left side, takes an early apex, about 5 m before the geometric apex, and lets the car run out to the left on exit.
- Turns
- 63° right
- Tightest radius
- 71 m
- Model speed
- 47 → 38 mph
- Braking (model)
- 20 m
- Grade
- -1.0%
- C20
Slow right-hander
↱ RightslowhairpinTRACK numbering
A slow right-hand hairpin that turns about 179°, tightening to a radius of roughly 20 m (66 ft). The model car brakes for about 150 m (492 ft), from 113 to 38 mph. The computed line turns in from the left side, takes an early apex, about 5 m before the geometric apex, and lets the car run out to the left on exit.
- Turns
- 179° right
- Tightest radius
- 20 m
- Model speed
- 113 → 38 mph
- Braking (model)
- 150 m
- Grade
- -0.1%
05Configurations
Every mapped loop at Sonoma.
TRACK finds each closed loop in the OpenStreetMap raceway network. Named layouts come from OSM circuit relations; the rest are named by length, and some may be combinations the venue never runs. Your first session confirms which one you drove.
Sonoma SRO
2.57 mi4.13 kmClockwiseS/F Estimated
Layout B · 3.3 km
2.02 mi3.26 kmClockwiseS/F EstimatedName inferred
Layout C · 3.2 km
2.01 mi3.23 kmClockwiseS/F EstimatedName inferred
Layout D · 3.0 km
1.88 mi3.03 kmClockwiseS/F EstimatedName inferred
Layout E · 1.1 km
0.67 mi1.08 kmDirection unknownS/F EstimatedName inferred
06Time it with TRACK
Drive Sonoma. TRACK knows where you are.
No setup and no transponder. Start a session in the paddock and TRACK recognises Sonoma and the layout from your GPS trace, then times every lap and sector with a live delta to your best.
- 1DetectTRACK matches your first few hundred metres against every mapped layout at Sonoma, including shared pavement between configurations.
- 2Confirm the lineThe start/finish line here is estimated. When you’re stopped, TRACK shows it on the map: accept it or tap to move it. You’re never asked while driving.
- 3Laps, timed retroactivelyLaps you drove before confirming are timed from the recorded trace, so you don’t lose your first session.
- 4Go furtherSync a GoPro for video with telemetry and let TRACK Engineer point out where the time is. External 10–25 Hz GPS receivers for tighter sectors are awaiting hardware validation.
- Venue and layout detection is tested on simulated drives over real OpenStreetMap circuits, not yet in a real car. Compatible GPS receivers
07Plan your trip
Getting there, staying, eating.
Nearby places for Sonoma haven’t been loaded yet.
08Track days
Find an open track day at Sonoma.
TRACK doesn’t copy event listings. An on-page calendar will come with an organizer data partnership.
Before your first day here
09Nearby tracks
Closest mapped venues.
- Thunderhill Raceway ParkCalifornia · 95 mi away
- WeatherTech Raceway Laguna SecaCalifornia · 116 mi away
- Buttonwillow Raceway ParkCalifornia · 245 mi away
- Southern Oregon SpeedwayOregon · 294 mi away
Straight-line distance between venues. All 96 tracks
FAQ
Sonoma, answered.
How long is Sonoma?
OpenStreetMap maps 5 closed loops at Sonoma Raceway, from 0.67 mi to 2.57 mi (4.13 km). These are mapped centerline lengths; the venue’s published figures can differ slightly.
How much elevation change is there at Sonoma?
About 157 ft (48 m) between the lowest and highest points of the sonoma sro layout, from USGS 3DEP elevation data sampled every 25 m. The steepest stretch is around 15%.
Which direction does Sonoma run?
The main mapped layout runs clockwise, from one-way tagging in OpenStreetMap. Check the event’s driver briefing: some venues run reverse-direction days.
Can I time laps at Sonoma with my phone?
Yes, with the TRACK iPhone app (beta). It recognises Sonoma and the layout you’re driving from GPS, then times laps and sectors. A phone’s GPS is good for lap times; an external 10–25 Hz receiver tightens sector splits.
Where is the start/finish line at Sonoma?
TRACK estimates the line from the mapped geometry (usually beside the pit lane, or on the longest straight). It isn’t verified on site, so the app asks you to confirm or move it before timing your first session here.
How do I find track days at Sonoma?
Clubs and organizers list HPDE, track days and club races on MotorsportReg. The venue’s own calendar (also linked) lists its events too. TRACK doesn’t list events itself.
Where can I stay near Sonoma?
This page lists hotels, campgrounds, restaurants, fuel and parts stores near Sonoma from OpenStreetMap, with straight-line distances. Book early for big event weekends.
Track geometry and nearby places: © OpenStreetMap contributors, available under the Open Database License 1.0 (via the TRACK Atlas, snapshot 2026-10-17). Elevation: USGS 3DEP (public domain). Lengths are mapped centerlines, not official figures. The computed line and speed trace are a model. No start/finish line has been verified on site.
TRACK is not affiliated with or endorsed by Sonoma Raceway, MotorsportReg or any business listed here. The venue name identifies the location only and belongs to its owner. TRACK shows no lap records or official results for this venue. Driving advice is general: your instructor, the event’s rules and the venue’s rules come first.