Istria 100 by UTMB - 168K

Istria 168K Finish Time Predictor

Istria 168K race stats pre-loaded (168 km, 6,800 m D+). Enter a known race result to get an elevation-adjusted finish time estimate.

168km6,800m D+Winner: ~17h56Cutoff: 45h

Full Istria 100 by UTMB - 168K course data: aid stations, cutoffs, course profile

1. Your race

Istria 168K

168 km · 6800 m D+ · 7093 m D-

Different race?

Have the GPX? Measure the exact course in the GPX Explorer

2. How should we estimate you?

From my Strava historyYour last 90 days of real training. Opens the TrailMath app.Read-only access to your activities. Nothing is posted to Strava, and no training plan is created until you ask for one.

Distance (km)

Elevation gain (m)

Elevation loss (m)

Same as gain. Edit if different.

Finish time

Hours, or h:mm

3. Your predicted finish

236.0 km-effort (ITRA, gain only)271.5 km-effort

Add a past race or your index to get a finish time.

Istria 168K finish times by UTMB Index

Predicted finish on the Istria 168K course (168.0 km, 6,800 m D+) for each UTMB Index, with the margin to the 45h00 cutoff.

Istria 168K: predicted finish time by UTMB Index
UTMB Index	Predicted finish	Average pace	Margin to cutoff
850	17h45	6:20 /km	+27h15
800	19h24	6:56 /km	+25h36
750	21h12	7:34 /km	+23h48
700competitive	23h10	8:17 /km	+21h50
650	25h20	9:03 /km	+19h40
600	27h41	9:53 /km	+17h19
550	30h16	10:49 /km	+14h44
500mid-pack	33h05	11:49 /km	+11h55
450	36h10	12:55 /km	+8h50
400back of the pack	39h32	14:07 /km	+5h28
350	43h13	15:26 /km	+1h47
300	47h14	16:52 /km	2h14 past the cutoff

The 45h00 cutoff sits at about Index 327. The typical winning time, 17h56, sits at about Index 844. At the 2026 edition, the median of the 256 finishers took 32h56, about Index 503. A model estimate, not an official ITRA or UTMB figure.

From a result you already have

What the predictor gives on Istria 168K for a few common reference results.

Istria 168K: predicted finish from reference results
Road marathon	3h00 → 29h19	3h30 → 34h12	4h00 → 39h06	4h30 → 43h59
50 km trail, 2,000 m D+	5h30 → 24h24	6h30 → 28h51	7h30 → 33h16	8h30 → 37h40

Road marathons use the tool's rougher power-law fallback.

For arrival times at each checkpoint, use the Istria 168K aid station planner.

Istria 168K course in numbers

Climbing per km: 40 m
ITRA km-effort: 236 (100M)
Highest point: 1,386 m
Biggest climb: +1,451 m over 13.1 km at 10.6% (from Mošćenička Draga)
Steepest climb: +389 m over 2.9 km at 13.5%
Longest descent: -853 m over 10.7 km at 7.6% (through Poklon)
Track climbing above 3%: 33%
Winning time / cutoff: 17h56 / 45h00 (2.5x the winner's time)

Section-by-section climbs, descents and grades are on the Istria 168K course page.

Predict your Istria 168K finish time from a reference race result, adjusted for the course's 168 km and roughly 6,800 m of elevation gain. The overall cutoff is 45h.

About Istria 100 by UTMB - 168K

Istria 100 by UTMB - 168K covers 168 km with around 6,800 m of elevation gain, starting in Labin, Croatia. The overall cutoff is 45 hours.

Crew access is allowed at Mošćenička Draga (34.79 km), Poklon (51.35 km), Buzet (98.6 km) and Livade (130.88 km). Drop bags are available at Buzet.

Checkpoint data approximate - verify against the current official race guide at istria.utmb.world before your race.

How the prediction works

Your result becomes a UTMB Index, mapped onto Istria 168K by the calibrated model behind the ITRA / UTMB Index Estimator. Full methodology.

Build a training plan targeted at your Istria 168K goal time

TrailMath uses these models to build periodized plans adjusted to your goals and terrain.

Start free