Col Agnel gains 1,287 m (4,223 ft) over 20.5 km (12.7 mi) at a 6.2% average grade. The grade is remarkably consistent for a climb of this length and altitude - it never reaches double figures for a sustained stretch, with the steepest mile averaging 8.6% and the steepest kilometer 9.1%. That steepest section comes in the final few kilometers as the road leaves the last hamlets behind and climbs open, treeless terrain to the border.
Roadway: The road is paved the entire way and is in good condition, typical of a well-maintained French departmental mountain road. Col Agnel is a seasonal high pass - it typically closes for winter in late October and reopens by mid-June depending on snowmelt, so check the Hautes-Alpes department's pass status pages before an early- or late-season attempt. On select summer dates the Guillestrois-Queyras area also reserves several of its mountain passes, including Agnel, for cyclists.
Traffic: Traffic is light to moderate. The first several kilometers through Ville-Vieille and the small hamlets above it see local traffic, and the road carries a steady trickle of touring cyclists and motorcyclists in July and August since it's a scenic through-route into Italy. Above the last hamlets, traffic thins out considerably.
Parking: Ville-Vieille, in the Château-Ville-Vieille commune, is the natural start and has roadside parking near the village. Riders can also base themselves in nearby Molines-en-Queyras or make the short detour up to Saint-Véran, the highest village in Europe, before or after the ride.
At nearly 2,744 m (9,003 ft), the summit is genuinely alpine - expect a real temperature drop and wind exposure over the final open kilometers even on a warm summer day, so pack a wind/rain shell regardless of conditions at the start. There's no services above the last hamlets until the Refuge Agnel, a mountain hut a couple of kilometers below the top that typically offers food and drinks in season - a good spot to refuel before the final push or the descent into Italy.
Ville-Vieille and Molines-en-Queyras, the small villages at the base, sit inside the Queyras Regional Natural Park - a quiet, less-touristed corner of the French Alps compared to its neighbors around Briançon. Saint-Véran, a few hundred meters up a side road from the start, is the highest permanently inhabited commune in Europe (2,042 m) and worth a wander for its traditional wood-and-stone Queyras architecture.
Because the pass tops out on the Italian border, it's a natural way to link a French and Italian ride - the descent into Italy leads to Chianale and the Varaita valley. The Queyras also has a cluster of shorter climbs out of the same valley worth combining into a multi-day trip; our Routes in the Area tool is a good way to see what else is nearby.