The Rimutaka Hill Rd did not reopen yesterday after police closed it on Sunday afternoon.
The New Zealand Transport Agency website said the road would be closed until further notice, with a review of the situation due today.
On Sunday, 100 motorists were left stranded on the hill due to
icy conditions and needed to be rescued by police using four-wheel-drive vehicles.
The officer in charge of Pahiatua station, Jymahl Glassey, said the section of SH2 at Mount Bruce was also closed intermittently on Sunday night, but contractors were on site early yesterday with a grader to clear snow away.
The Pahiatua Track and Saddle Rd were closed overnight on Sunday, with the Manawatu Gorge also closed briefly between 4.30am-5am yesterday.
"People seem to be taking it quite slowly and sensibly so we've only had one very minor incident on the roads so far," he said.
Wellington district road policing manager Inspector Peter Baird warned people against playing near busy roadsides.
"During the recent road closure on the Rimutaka Hill Rd, there were reports of children seen running between cars and crossing the road to get closer to the snow, putting themselves at real risk in the icy conditions," Mr Baird said.
"We suggest those who want to play in the snow avoid busy roads and state highways and find some quieter streets to enjoy the white stuff."
Air transport in the region was also suffering the effects of the wintry blast yesterday, with Masterton's Hood Aerodrome closed all day.
The Sunday night flight to Masterton from Auckland was the first to go, with yesterday's outbound and inbound flights also cancelled.
Airport manager Tony Heyward said this morning's flight to Auckland was also cancelled but the possibility of resuming services would be reviewed on a daily basis.
Train services between Wairarapa and Wellington ran yesterday, with no problems or delays reported by yesterday afternoon.
Power
Electricity was cut to several Wairarapa locations as high winds and snow caused trees and branches to bring down powerlines throughout the lower North Island.
Power was cut to parts of Masterton, Longbush, Mauriceville, Mount Bruce and Eketahuna on Sunday from 6.45pm.
Supplier Powerco said by yesterday morning most of the 3500 outages had been fixed, but power remained off for 800 residents including some in Wairarapa.
Network operations manager Phil Marsh said the situation was expected to be resolved by last night.
But he said if the weather worsened his field staff would be called off the job until it was safe for them to be back on the roads.
Forecast
The MetService has forecast that the chilly weather is expected to continue until at least midweek, but possibly until the end of the week.
"Bitterly cold conditions" were forecast, with significant snowfalls for southern and eastern parts of the South Island as well as southern and central parts of the North Island.
However, snowfalls were expected to ease tomorrow and were unlikely to continue down to sea level.
BeachesCastlepoint Holiday Park and Motels manager Kerry Ellis said there was snow overnight at Castlepoint, which continued throughout the day.
"We've got snowflakes coming down but not enough to stay on the ground," he said.
Mr Ellis said the Castlepoint Store was closed yesterday, and it was "very quiet".
"All the hills around us got a good dusting of snow," he said.
Bob Alsap, of Riversdale Beach Store, said there was snow on the beach, and on the ground yesterday morning.
"It's not cold enough to sit on the road," he said, "it's melting pretty quick."
ServicesElsewhere, a raft of other services were affected, including disruptions to the postal and justice systems.
The mail run was cancelled throughout the region yesterday, with Masterton, Featherston, Greytown, Carterton and Martinborough all missing out on letters and parcels.
The NZ Post website said mail deliveries were being attempted in Eketahuna "but might not be able to be completed".
Masterton District Court sittings were also cancelled after the judge was unable to make it to court due to the weather.
Wairarapa Civil Defence emergency manager Paul Walker said people should check on their neighbours, and check their emergency supplies and torches.
He also urged people to make sure they had have replenished their emergency water supply and to have alternative heating and cooking facilities.