republic-os/legislation/us/states/co/2023a/hb-23-1231.md

---
type: "Bill"
title: "Math In Pre-kindergarten Through Twelfth Grade"
description: "The act requires the department of education (department), by January 2024, to offer free optional trainings in evidence-informed practices in mathematics, including a training specifically designed for elementary school educators and a training specifically designed for secondary school mathematics educators. Each training must include instruction on interventions for students who are below grade level or struggling in mathematics, children with disabilities, and students who are English language learners. Trainings must be available to relevant staff of school districts, related administrative units, district charter schools, institute charter schools, boards of cooperative services, and community-based organizations."
jurisdiction: "us/states/co"
legislature: "Colorado General Assembly"
session: "2023A"
identifier: "HB 23-1231"
citation: "Colorado HB 23-1231 (2023A)"
classification: ["bill"]
subjects: []
status: "enacted"
primary_sponsors: ["Barbara McLachlan", "Janice Marchman", "Paul Lundeen", "Rose Pugliese"]
version_count: 12
action_count: 16
vote_count: 4
first_action: "2023-03-07T07:00:00+00:00"
last_action: "2023-05-15T06:00:00+00:00"
source: "openstates"
source_identifier: "ocd-bill/cf4a203c-8c26-46b5-945c-9f0c8d9b2013"
source_url: "https://leg.colorado.gov/bills/hb23-1231"
source_hash: "39f63b43c4c424f05db4943cd6e26780f33cdb252f993ceb3448792208bcb34b"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-co"]
---

# Colorado HB 23-1231 (2023A) — Math In Pre-kindergarten Through Twelfth Grade

The act requires the department of education (department), by January 2024, to offer free optional trainings in evidence-informed practices in mathematics, including a training specifically designed for elementary school educators and a training specifically designed for secondary school mathematics educators. Each training must include instruction on interventions for students who are below grade level or struggling in mathematics, children with disabilities, and students who are English language learners. Trainings must be available to relevant staff of school districts, related administrative units, district charter schools, institute charter schools, boards of cooperative services, and community-based organizations.

## Version chain

The bill's text revisions, in order — the diff chain from filing to enrollment.

1. **Committee Amendment** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/2023a_hb1231_s_app_004.pdf)
2. **Engrossed (04/12/2023)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2023A/bills/2023a_1231_eng.pdf)
3. **Final Act (05/12/2023)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2023A/bills/2023a_1231_enr.pdf)
4. **Introduced (03/07/2023)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2023A/bills/2023a_1231_01.pdf)
5. **PA1 (03/21/2023)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2023A/bills/2023a_1231_h_ed_01.pdf)
6. **PA2 (04/10/2023)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2023A/bills/2023a_1231_h_ed_app_01.pdf)
7. **PA3 (04/25/2023)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2023A/bills/2023a_1231_s_ed_01.pdf)
8. **PA4 (04/28/2023)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2023A/bills/2023a_1231_s_ed_app_01.pdf)
9. **Reengrossed (04/13/2023)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2023A/bills/2023a_1231_ren.pdf)
10. **Rerevised (05/01/2023)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2023A/bills/2023a_1231_rer.pdf)
11. **Revised (04/28/2023)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2023A/bills/2023a_1231_rev.pdf)
12. **Signed Act (05/15/2023)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/2023a_1231_signed.pdf)

## Votes

- BILL — **26–9** (pass) · upper
- BILL — **51–12** (pass) · lower
- CONCUR — **59–6** (pass) · lower
- REPASS — **54–11** (pass) · lower

## Sponsors

- Barbara McLachlan — primary (person)
- Janice Marchman — primary (person)
- Paul Lundeen — primary (person)
- Rose Pugliese — primary (person)

## Timeline

The legislative action history — every referral, reading, and vote.

- **2023-05-15T06:00:00+00:00** Governor Signed `executive-signature`
- **2023-05-12T06:00:00+00:00** Sent to the Governor `executive-receipt`
- **2023-05-12T06:00:00+00:00** Signed by the President of the Senate
- **2023-05-11T06:00:00+00:00** Signed by the Speaker of the House
- **2023-05-02T06:00:00+00:00** House Considered Senate Amendments - Result was to Concur - Repass
- **2023-05-01T06:00:00+00:00** Senate Third Reading Passed - No Amendments `passage, reading-3`
- **2023-04-28T06:00:00+00:00** Senate Second Reading Special Order - Passed with Amendments - Committee
- **2023-04-28T06:00:00+00:00** Senate Committee on Appropriations Refer Amended to Senate Committee of the Whole `committee-passage, referral-committee`
- **2023-04-24T06:00:00+00:00** Senate Committee on Education Refer Amended to Appropriations `referral-committee`
- **2023-04-14T06:00:00+00:00** Introduced In Senate - Assigned to Education `introduction`
- **2023-04-13T06:00:00+00:00** House Third Reading Passed - No Amendments `passage, reading-3`
- **2023-04-12T06:00:00+00:00** House Second Reading Special Order - Passed with Amendments - Committee, Floor
- **2023-04-10T06:00:00+00:00** House Second Reading Special Order - Laid Over Daily - No Amendments
- **2023-04-10T06:00:00+00:00** House Committee on Appropriations Refer Amended to House Committee of the Whole `committee-passage, referral-committee`
- **2023-03-16T06:00:00+00:00** House Committee on Education Refer Amended to Appropriations `referral-committee`
- **2023-03-07T07:00:00+00:00** Introduced In House - Assigned to Education `introduction`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/cf4a203c-8c26-46b5-945c-9f0c8d9b2013`. Confidence: reported (aggregated from official Colorado legislature records).