The 2019 committee deadlines have not been determined yet.
The 2018 committee deadlines are listed in this letter signed by House and Senate leadership. The committee deadlines are:
1st deadline - March 22, 2018 at midnight
2nd deadline - March 29, 2018 at midnight
3rd deadline - April 20, 2018 at midnight
There is no yearly deadline for the introduction of bills. However, each year the Legislature establishes deadlines for committee action on bills. Committee deadlines are announced during the first half of a session in order to winnow the list of topics to be dealt with that year.
"The deadlines do not apply to the House committees on Capital Investment, Ways and Means, Taxes, or Rules and Legislative Administration, nor to the Senate committees on Capital Investment, Finance, Taxes, or Rules and Administration."
"The first deadline is for committees to act favorably on bills in the house of origin."
"The second deadline is for committees to act favorably on bills, or companions of bills, that met the first deadline in the other house."
"The third deadline is for committees to act favorably on major appropriation and finance bills."
"When a committee in either house acts favorably on a bill after a deadline established in the concurrent resolution, the bill must be referred in the Senate to the Committee on Rules and Administration and in the House of Representatives to the Committee on Rules and Legislative Administration for disposition. Either rules committee, when reporting a bill referred to the committee under this rule, may waive application of the rule to subsequent actions on that bill by other committees." (Joint Rule 2.03, Deadlines)