"Tickets for the tests and the Crusaders match on June 10 are no longer available and several ticket categories across all venues are already exhausted. The clear message is don't leave it too late to buy tickets for the matches still on sale.
"It's a good position to be in with 107 days to go until the series kicks-off and the planning for the 10 matches and arrival of the Lions team and supporters shifting up a gear," Mr Cass said.
Only general admission tickets are available for the opening match in Whangarei and the Maori All Blacks game in Rotorua, while availability in some ticket categories is limited in Dunedin, Hamilton and Wellington.
Tickets for matches involving the New Zealand Provincial Barbarians, Super Rugby teams and the Maori All Blacks start at $39, while children's tickets start at $10 for the Barbarians and $29 for the other non-test matches.
In addition, the official travel and hospitality programmes from All Blacks Tours and All Blacks Hospitality are tracking strongly, with sales to date exceeding initial forecasts.
Regions hosting matches during the series were busy planning events and activities that would appeal to visitors and local communities.
"We are working closely with government and local regions to deliver the matches and are really encouraged by the planning underway to create events that excite fans around the country," he said.
"There's a festival of great events under development including a long lunch in Whangarei, an NZSO special 'Night at the Proms' style event, a world record Haka attempt planned for Rotorua and fanzones throughout the country packed with great activities before the matches."
The full programme for the DHL NZ Lions Series 2017 will be officially launched in March and will showcase New Zealand culture, arts, music, entertainment, food & beverage and kiwi innovation.
"No other event delivers the level of excitement and interest that the Lions Series does. The unique atmosphere that New Zealand and Lions fans will create will make for an incredible six weeks," said Mr Cass.
For further information and tickets visit nzlionsseries17.com
Ticketing snapshot
NZ Provincial Barbarians - Whangarei
Only General Admission tickets remain available, Category A, B and C ticket allocations exhausted.
Blues - Auckland
Selling well with limited tickets available in all categories.
Crusaders - Christchurch
Ticket allocation is exhausted.
Highlanders - Dunedin
Very limited Category A and B tickets remain available, with Category C and D tickets also available.
Maori All Blacks - Rotorua
Only General Admission tickets remain currently available. Category A and B ticket allocations are exhausted.
Chiefs- Hamilton
Only Category D and General Admission tickets remain available. Category A, B and C ticket allocations exhausted.
Hurricanes - Wellington
Very limited Category A and B tickets remain with Category C and D tickets also available.