Distance: 4.5 km (1.3 DOC hours) - Benched track - Easy terrain
Altitude: 15m to 408m. Gain: 475m. Loss: 185m . Gradient: 8 deg (Gentle)
Skills:

Benched track (3/9)
Benched, maintained, marked tramping track or pack-track

Primary, mapped (1/5)
Formal route, on maps, principal access to hut or along range / catchment

Gentle (difficulty: 2/5)
Gentle slopes

Easy (difficulty: 1/5)
Grass / prepared surface

None (difficulty: 1/7)
No alpine skills required

None (difficulty: 1/6)
No unbridged river crossings

None (difficulty: 1/7)
No alpine skills required

Follow the well signposted trails up the Farm Race Walk before heading uphill and climbing the spur. You'll pass a large cabbage tree which is a good spot for a breather before climbing on up past a viewpoint at 'The Rocks'. Over a fence, into some pine plantation and follow the forestry/farm roads up to the junction.
https://www.wellingtonregionaltrails.com/trails/whareroa-farm-recreation-reserve/ti-kouka-rocks-track/

Note: Described in the reverse direction to your journey

Follwo the forestry/farm road down the hill. Keep a good lookoput for the unmarked track down the forested spur to the Rocks and Ti Kouka. No stress if you miss it - just carry on down the road to Cambelll's Mill Road and then down one of the numerous tracks.