She said hiring relief milkers, or asking family members, to step in and take over can allow farmers a well-deserved rest.
"You might need to plan for water supply to stock, perhaps repairs and services to water pumps, but then also plan a break. You are the most important asset on the farm," said the Waipu-based co-ordinator.
She said refusing to take time off could result in health and safety risks, as tired farmers were more likely to make basic errors of judgment.
"If you don't take time off, you're also less likely to be able to cope with stress later in the year. You need to rest for your physical and mental health."
She said those with autumn calving would be jumping into work after the holidays, while any dry spells in February and March would mean more physical work with supplement feeding. "So far, it looks like we will get rain so hopefully, that won't be an issue.
But January also offered a prime time to spend time with family and friends.
"This is also the time of year that your children are off school - why not enjoy time with them. Everyone will benefit from that," she said.
Ms Jonker said there were five ways to wellness for those living and working the rural life.
"Connect - with people around you, and your community. Reaching out helps.
"Give - your time, your presence and your words. Take notice - of the simple things that give you joy. Keep learning - embrace new experiences, see opportunities and surprise yourself. And finally, be active."
To talk to Northland Rural Support Trust, call 0800 787 254 - You are the most important asset on the farm.