Istria 100 by UTMB - 69K

Istria 69K Finish Time Predictor

Istria 69K race stats pre-loaded (69.6 km, 2,400 m D+). Enter a known race result to get an elevation-adjusted finish time estimate.

69.6km2,400m D+Winner: ~5h39Cutoff: 15h

Full Istria 100 by UTMB - 69K course data: aid stations, cutoffs, course profile

1. Your race

Istria 69K

69.6 km · 2400 m D+ · 2471 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

93.6 km-effort (ITRA, gain only)106.0 km-effort

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

Istria 69K finish times by UTMB Index

Predicted finish on the Istria 69K course (69.6 km, 2,400 m D+) for each UTMB Index, with the margin to the 15h00 cutoff.

Istria 69K: predicted finish time by UTMB Index
UTMB Index	Predicted finish	Average pace	Margin to cutoff
850	5h37	4:51 /km	+9h23
800	6h09	5:18 /km	+8h51
750	6h43	5:47 /km	+8h17
700competitive	7h20	6:20 /km	+7h40
650	8h01	6:55 /km	+6h59
600	8h46	7:34 /km	+6h14
550	9h35	8:16 /km	+5h25
500mid-pack	10h29	9:02 /km	+4h31
450	11h27	9:52 /km	+3h33
400back of the pack	12h31	10:48 /km	+2h29
350	13h41	11:48 /km	+1h19
300	14h58	12:54 /km	+0h02

The 15h00 cutoff sits at about Index 299. The typical winning time, 5h39, sits at about Index 847. At the 2026 edition, the median of the 575 finishers took 10h13, about Index 514. A model estimate, not an official ITRA or UTMB figure.

From a result you already have

What the predictor gives on Istria 69K for a few common reference results.

Istria 69K: predicted finish from reference results
Road marathon	3h00 → 9h16	3h30 → 10h48	4h00 → 12h21	4h30 → 13h54
50 km trail, 2,000 m D+	5h30 → 7h44	6h30 → 9h08	7h30 → 10h32	8h30 → 11h56

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

For arrival times at each checkpoint, use the Istria 69K aid station planner.

Istria 69K course in numbers

Climbing per km: 34 m
ITRA km-effort: 94 (50K)
Highest point: 409 m
Biggest climb: +389 m over 2.9 km at 13.5%
Longest descent: -264 m over 13.3 km at 1.6% (down to Umag (Finish))
Track climbing above 3%: 27%
Winning time / cutoff: 5h39 / 15h00 (2.7x the winner's time)

Section-by-section climbs, descents and grades are on the Istria 69K course page.

Predict your Istria 69K finish time from a reference race result, adjusted for the course's 69.6 km and roughly 2,400 m of elevation gain. The overall cutoff is 15h.

About Istria 100 by UTMB - 69K

Istria 100 by UTMB - 69K covers 69.6 km with around 2,400 m of elevation gain, starting in Buzet, Croatia. The overall cutoff is 15 hours.

Crew access is allowed at Livade (32.24 km).

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 69K by the calibrated model behind the ITRA / UTMB Index Estimator. Full methodology.

Build a training plan targeted at your Istria 69K goal time

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

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