Table 1. States with a time limit after an initiative is passed before the legislature may alter or repeal the initiative.
|State||Citation||Alteration time limit|
|Alaska||AK Const. Art. 11, § 6||Two years|
|Nevada||N.R.S. Const. Art. 19, § 2||Three years|
|North Dakota||NDCC Const. Art. 3, § 8||Seven years (or two-thirds vote prior to seven years)|
|Washington||RCWA Const. Art. 2, § 1||Two years (or two-thirds vote prior to two years)|
|Wyoming||Const. Art. 3, § 52||Two years|
Table 2. States with different voter requirements for constitutional amendments.
|State||The requirement to alter the constitution|
|Colorado||55% of voters must approve|
|Florida||60% of voters must approve|
|Nevada||Only a majority is needed, but it must be approved in two consecutive elections|
|Illinois||Either 60% of voters must approve, or a majority of those voting in the election as a whole|
Table 3. States with supermajority requirements for legislatures to ballot initiatives.
|Arizona||A.R.S. Const.Art. 21 § 1, Part 6||May amend the initiative with three-fourths vote, but may only amend to “further the purpose” of the measure.|
|Arkansas||Arkansas Const.Art. 5 § 1||Two-thirds vote to amend or repeal.|
|Michigan||MI Const.Art. 2, § 9||May be amended or repealed only by three-fourths of each house or by a vote of the electors.|
|Nebraska||Ne.Rev.St. CONST.Art. III, § 2||Two-thirds vote to amend or repeal.|
|North Dakota||NDCC Const.Art. 3, § 8||Two-thirds vote (or majority after seven years).|
|Oregon||OR CONSTArt.II, § 23;Art. IV, § 1||Supermajority vote only to change vote requirement.|
|Washington||RCWA Const.Art. 2, § 1||Two-thirds vote (or majority after two years).|
*NOTE: This memo was written in response to a specific legislator request and is meant to supplement the research contained in the following full Science Notes: Initiative Petition Process and Initiative Petition Impacts.