Colorado Ballot Access Requirements

Reviewed July 2026

Colorado charges no candidate filing fee at all, and its circulator rules are among the most permissive in the country. What makes Colorado hard is geography: constitutional amendments must clear a threshold in every single one of the state's 35 senate districts, with no slack anywhere.

Verify before you rely on this. Requirements tied to prior election turnout or voter registration are recalculated every cycle, and election law changes — sometimes mid-cycle, sometimes by court order. This page reflects our research as of July 2026 and is general industry information, not legal advice. Always confirm current figures and deadlines with the state election authority before building a plan around them.

Signature Requirements

Office / Measure	Requirement
Statewide, major party	1,500 from each of the 8 congressional districts
Statewide, minor party or unaffiliated	1,000 per congressional district
U.S. House, major party	Lesser of 10% of primary votes or 1,500
State Senate	Lesser of 1,000 or 30% of primary votes
State Representative	Lesser of 1,000 or 30% of primary votes
Initiated statute	124,238 — 5% of the last Secretary of State vote
Initiated constitutional amendment	124,238 statewide plus 2% of registered electors in all 35 state senate districts
Veto referendum	124,238, filed within 90 days of session adjournment

Percentage-based candidate figures move each cycle with turnout. Initiative figures recalculate every four years.

The all-35-districts rule

Amendment 71, passed in 2016, requires an initiated constitutional amendment to gather signatures from at least 2% of registered electors in each of Colorado's 35 state senate districts. Not a majority of districts — all of them. Falling short in a single rural district kills the measure regardless of the statewide total. Amendments also require 55% voter approval to pass.

Statute versus amendment is the key decision

Initiated statutes are exempt from the distribution requirement entirely and need only a simple majority to pass. Unless a measure genuinely requires constitutional status, the statutory route is dramatically cheaper to qualify and easier to win.

Verification bands drive your target

The Secretary of State examines no fewer than 5% of signatures, and never fewer than 4,000. Below 90% projected valid, the petition is insufficient. Above 110%, it is sufficient. Between 90% and 110%, a full line-by-line examination of every signature is mandatory — slow, expensive, and unpredictable. The real target is 110% of the minimum, which in practice means gathering well above the statutory number.

Circulator rules are permissive, notarization is not

Circulators need only be U.S. citizens aged 18 or older — no Colorado residency, no voter registration, no party affiliation. But every petition section requires a notarized circulator affidavit, and an affidavit notarized in violation of the requirements invalidates the entire section. Circulators must also wear badges reading VOLUNTEER CIRCULATOR or PAID CIRCULATOR, and paid circulators must work through a licensed petition entity.

The deposition rule

If a petition is challenged and a circulator cannot be produced for deposition, every signature in that circulator's sections is void. This is an underrated risk and argues strongly for stable, locally based crews and good contact records.

Ballot Measures in Colorado

Colorado has initiated statutes, initiated constitutional amendments, and veto referendum. Both initiative types require 5% of the total votes cast for Secretary of State at the last general election — 124,238 for the current cycle. Circulation runs six months from the date the Title Board sets the final ballot title, and petitions must be filed at least three months before the general election. Note that Amendment K, which would have changed those deadlines, failed in November 2024 — treat any source citing a different deadline as out of date.

What Trips Campaigns Up in Colorado

A candidate who receives less than 10% of the vote at a party assembly is barred from the petition route for that office — you must choose your path before you know the outcome.

The cure period is five calendar days and covers circulator affidavit errors only. There is no cure for signature validity and no chance to gather more.

Landing between 90% and 110% of the requirement triggers a mandatory full count of every signature.

Colorado's candidate signature requirement is distributional too — 1,500 in each of eight congressional districts, not 12,000 statewide.

Some widely used secondary sources incorrectly state that Colorado circulators must be state residents. The statutes require only U.S. citizenship and age 18.

Track Record

We've Worked This Ground

325K+

Signatures Collected

100%

Ballot Access Success

50+

Campaigns Completed

13+

States

Common Questions

Colorado Ballot Access FAQ

How many signatures does a Colorado ballot initiative need?

124,238 for the current cycle, equal to 5% of the total votes cast for Secretary of State at the last general election. Constitutional amendments must additionally gather 2% of registered electors in every one of the 35 state senate districts.

What is Colorado's distribution requirement?

Initiated constitutional amendments must reach 2% of registered electors in all 35 state senate districts. Initiated statutes have no distribution requirement at all, which is the main reason many Colorado campaigns choose the statutory route.

Do Colorado petition circulators need to live in Colorado?

No. Colorado law requires only that a circulator be a U.S. citizen aged 18 or older. There is no residency or voter registration requirement for either candidate or initiative petitions.

How long do you have to gather signatures in Colorado?

Six months from the date the Title Board sets the final ballot title, with the petition due at least three months before the general election. If the title is set late, the practical window is shorter.

Colorado