Every state department of transportation runs its highway construction program through lettings: scheduled public openings of sealed bids, usually for a batch of projects at once. If you have only worked private negotiated jobs, the system looks rigid. If you learn to read it, it is the most predictable public pipeline in construction, because the dates are published long in advance, the plans are posted online, and the results, down to every unit price, are published after the bids are read.
This guide walks through how letting schedules actually work, using the calendars that four large DOTs publish themselves, and the federal rules that shape every federal-aid letting. Where a number appears below, it comes from the agency page or regulation named next to it.
What a Letting Is, Using Real Calendars
A letting is the formal receipt and opening of bids and the identification of the apparent low bidder. Texas DOT defines it in almost exactly those words on its contract letting page, and the way TxDOT runs it is a good template for the rest of the country.
Texas: two consecutive days, every month
According to TxDOT's contract letting page (checked October 18, 2026), the department conducts its statewide low-bid construction and maintenance letting in Austin on two consecutive days each month, and it publishes the schedule for the current and following fiscal year. The posted 2026 dates run January 6–7, February 4–5, March 4–5 and so on through November 3–4 and December 1–2, 2026. Dates are already listed through December 2028. TxDOT also notes that a live video stream is posted for each monthly statewide letting, that bids go in through its electronic bidding system (iCX), and that district offices hold separate local lettings, sometimes virtually.
The same page traces the system back to 1925, when the Texas Legislature passed the laws behind TxDOT's low-bid process: public notice, issued proposals, public bid opening, determination of the apparent low bidder, and contract execution. Post-letting, TxDOT publishes bid tabulations, a bid tabulations dashboard, lists of awarded and rejected projects, and a highway cost index.
Florida: a central office letting most months, plus district lettings
The Florida DOT central office letting page lists its 2026 letting dates: January 28, February 25, March 25, March 31 (a single drainage project, T3845 in Bay County, moved there from the March 25 letting), April 29, May 20, June 10, June 15, July 15, July 29, August 26, September 30, October 28 and December 2. Each letting is listed with its proposal IDs, county and major work type. The January 28, 2026 letting, for example, contained 16 proposals, mostly resurfacing, drainage and bridge work in counties from Duval to Miami-Dade.
The FDOT page also shows the after-the-letting rhythm. For the January 28 letting, intent-to-award notices were posted February 11, 2026 for most contracts, with awards dated February 18; three more were posted February 25 and awarded March 3. That is roughly three to five weeks from bid opening to award on routine state work. Each letting also carries 60-day and 30-day advertisements, plan and proposal holder lists, bid items, fuel allocations and work class breakouts.
California: rolling bid openings, not a monthly batch
Caltrans does not run one big monthly letting the way TxDOT does. Its Construction Manual (Chapter 3, Section 2, "Bidding") says bid opening dates and locations for all projects, including electronically bid projects, are posted on the Caltrans Contractor's Corner portal under "Calendar of Upcoming Bid Openings," and that Minor B bids are opened in Sacramento at 1727 30th Street at 3:00 p.m. on the date in the solicitation. Projects advertise and open on a rolling basis, so the calendar fills week by week rather than on one day a month.
Minnesota: a 12-month tentative schedule and Bid Express
MnDOT's bid letting pages state that all bids must be submitted electronically through Bid Express, that ads are published at least three weeks before letting, and that award is typically made within 30 days after letting once all contract clearances are met. MnDOT also publishes a 12-month tentative letting schedule (PDF and Excel) that the letting coordinator updates regularly. The schedule leaves out State Aid projects, which matters if you mostly chase county and city work.
The Federal Rules Behind Every Federal-Aid Letting
When federal-aid highway money is in a contract, a set of FHWA regulations in 23 CFR Part 635 controls how the state advertises and awards it. These are worth reading in full, because they explain much of what you see on a letting calendar. The citations below are from the eCFR text current as of October 1, 2026.
Advertising period: three weeks minimum
23 CFR 635.112(b) requires that the advertisement and approved plans and specifications be available to bidders at least three weeks before bid opening, unless the FHWA Division Administrator approves a shorter period in special cases. Caltrans' manual repeats the three-week minimum and adds "more if the project is complex." MnDOT's three-week ad rule is the same floor.
No home-state preference on federal-aid work
635.112(d) requires nondiscriminatory bidding procedures for all qualified bidders "regardless of National, State or local boundaries." Any state law or policy that would block a qualified out-of-state bidder does not apply to federal-aid projects, and the bid documents must say so. You still have to clear each state's administrative steps, which are covered below.
Award to the lowest responsive, responsible bidder
635.114(a) says federal-aid contracts are awarded only on the basis of the lowest responsive bid from a bidder meeting the state's responsibility criteria, with prior FHWA concurrence. Under 635.114(c), the state must check the apparent low bidder's unit prices against the engineer's estimate, and a bid with extreme variations from the estimate or obvious unbalancing gets a thorough evaluation. Rejecting all bids on a federal-aid contract requires FHWA concurrence and justification under 635.114(h). Note what the regulation does not do: it sets no fixed percentage over the estimate that triggers rejection. Any such threshold is a state policy, so check your state's own award guidelines.
Self-performance: at least 30 percent
635.116(a) requires each federal-aid contract to specify a minimum share of work the prime performs with its own organization, and that share cannot be less than 30 percent of the original contract price, after deducting identified specialty items. States may set the figure higher in the contract. The rule does not apply to design-build contracts. For subcontractors, the practical meaning is that a large share of every design-bid-build contract can be bought out after award.
Disclosure of the engineer's estimate
Practice varies by state. Caltrans' Construction Manual (Section 3-205) is explicit: until bids are opened, the engineer's item-by-item estimate is not public, and bidders may know only the total allocated funds on a specific project, which Caltrans lists in its weekly advertisements. Check each DOT's letting page for what it releases before and after bid day.
How the Money Reaches the Letting Calendar
Federal formula funds and the current extension
The Infrastructure Investment and Jobs Act set federal highway authorizations for fiscal years 2022 through 2026. A Congressional Research Service report, "Federal Highway Programs: In Brief" (R47022, January 31, 2022), puts the core federal-aid formula programs at $52.5 billion in FY2022, rising to $56.8 billion in FY2026, or $273.2 billion over the five years. The National Highway Performance Program is the largest, averaging $29.6 billion a year. The separate Bridge Formula Program adds $27.5 billion, in equal $5.5 billion annual amounts. The same report notes that states and localities normally provide a 20 percent match on non-Interstate projects and 10 percent on Interstate projects.
Those authorizations were due to expire September 30, 2026. They did not lapse. The Continuing Appropriations and Extensions Act, 2027 (H.R. 6500, which became Public Law 119-103) includes a Division C, the "Surface Transportation Extension Act of 2026," that continues the IIJA and earlier highway authorities from October 1 through December 11, 2026. For FY2027, programs are funded at a fraction of their FY2026 levels, based on the number of days in the extension period. If a long-term bill is not passed by then, expect another extension. Short extensions tend to make some DOTs cautious about how much they put on near-term letting calendars, so watch your state's 12-month schedule for slipped projects.
State money flows through the same lettings
Federal aid is only part of what goes through a letting. FHWA's Highway Statistics 2024, Table SF-2, puts state highway disbursements at $239.0 billion in 2024, up from $209.8 billion in 2023, with capital outlay of $116.3 billion. Texas ($27.2 billion), California ($21.4 billion) and Florida ($14.2 billion) were the largest. Our breakdown of what states spend on highways walks through that table. State-funded projects are let on the same calendars, but federal requirements such as the DBE program and 23 CFR 635 apply only where federal dollars are in the contract. The proposal tells you the fund source, so read it before you price.
The Rules of Entry
Prequalification
Most DOTs require prime bidders to be prequalified, and the paperwork takes time. Two examples, both from the agencies' own pages:
- Texas. TxDOT's contractor prequalification page lists three levels of qualification, all requiring annual requalification. The Confidential Questionnaire, normally used for construction projects, requires an audited financial statement from an independent CPA firm (per TxDOT Bulletin No. 2). The statement must be less than one year old. The lighter Bidder's Questionnaire covers projects where full requirements are waived, typically smaller construction, routine maintenance, emergency and specialty work.
- Florida. FDOT's prequalification page cites section 337.14, Florida Statutes, and Rule Chapter 14-22, F.A.C. Contractors must be prequalified to bid road, bridge or public transportation construction contracts greater than $250,000. Prequalification is not needed to bid as a prime on projects of $250,000 or less, to bid as a subcontractor in any amount, to bid buildings, or to bid maintenance contracts. FDOT's FAQ adds that subcontractors do not bid directly to FDOT and need no prequalification.
The practical lesson: if you spot an attractive project on next month's calendar and you are not already qualified in that state, you are probably too late for that letting. Start the application before you need it.
Electronic bidding credentials
Paper bids are mostly gone. MnDOT lays out its sequence: register for a state SWIFT vendor number, submit a MnDOT vendor form, subscribe to Bid Express and create a digital ID, then download the free Project Bids software and bid files. MnDOT tells new bidders to allow about a week for the first three steps. TxDOT uses its own iCX system for electronic bids and bonding. Every state is different, so set up your surety's electronic bond process and your digital ID well before bid day.
DBE requirements are changing
The Disadvantaged Business Enterprise program in 49 CFR Part 26 applies to USDOT-assisted contracts. Section 26.41 describes the statutory 10 percent figure as an aspirational national goal and states that recipients are not required to set their own goals at that level. The rule has changed substantially. Under amendments published October 3, 2025 (90 FR 47982) and September 25, 2026 (91 FR 60899), section 26.67 now requires every owner to demonstrate social and economic disadvantage individually, through a personal narrative, "without any presumptions based on race or sex." Section 26.68 sets the personal net worth cap at $2,047,000.
States are adjusting project goals in response. MnDOT's bid letting page carries a notice that starting September 11, 2026, advertised projects include either a numerical DBE goal or a DBE-neutral goal, and tells contractors to check each advertisement. Do not assume last year's DBE commitment approach still works. Read the goal language in each proposal, and confirm your DBE subs' current certification status.
Reading the Calendar Like an Estimator
What primes do
Primes work forward from the published schedule. They pick targets two or three lettings out, order plans, check the plan holder list to see who else is looking, and line up subcontractor and DBE commitments. Because lettings like TxDOT's are posted years ahead, you can plan estimating staff around them.
What subs and suppliers should do
Subcontractors and suppliers should use the calendar twice. Before the letting, plan holder lists are public. FDOT posts them per letting, Caltrans posts a "Plans Holders List and Opt-in Search," and MnDOT makes plan holder lists available alongside its plans and proposals. These tell you which primes are bidding which jobs, so you know who should get your quote. After the letting, bid tabulations and intent-to-award notices name the low bidder. Because federal-aid primes need only self-perform 30 percent, much of the work is still open to subs after award.
Use bid tabs as cost data
Published bid tabs give you every bidder's unit prices on every item. Pull the last several lettings in your state, compare winning prices on the five items you perform most against your own costs, and you will quickly see whether that market works at your numbers. The same discipline applies to federal work outside state DOTs. Our live bid board tracks open federal solicitations daily, and our guide on how to bid federal construction contracts covers the SAM.gov side.
Frequently Asked Questions
How far ahead are letting schedules published?
It depends on the state. TxDOT lists its statewide letting dates for the current and following fiscal year; in October 2026 its page showed dates through December 2028. MnDOT publishes a 12-month tentative letting schedule that it updates regularly. FDOT lists the year's central office letting dates with the projects in each. Projects on tentative lists can move. FDOT's 2026 page shows several moved between lettings, so treat anything more than a few months out as provisional.
How long is the advertising period?
On federal-aid projects, 23 CFR 635.112(b) requires plans and specifications to be available at least three weeks before bid opening, unless FHWA approves a shorter period in special cases. Caltrans and MnDOT both state a three-week minimum, and Caltrans allows more time for complex projects. FDOT lettings carry 60-day and 30-day advertisements.
Can an out-of-state contractor bid a DOT letting?
Yes. On federal-aid projects, 23 CFR 635.112(d) requires bidding procedures open to all qualified bidders regardless of state boundaries. You still need the state's prequalification (for example, FDOT for contracts over $250,000, or TxDOT's annual questionnaire), any state business registration and licensing, and electronic bidding credentials.
How much work must a prime self-perform?
On federal-aid design-bid-build contracts, at least 30 percent of the original contract price, excluding identified specialty items, under 23 CFR 635.116(a). The state may set a higher percentage in the contract. The 30 percent floor does not apply to design-build.
Are engineer's estimates public before the letting?
Generally not at the item level. Caltrans' Construction Manual says the item-by-item estimate is not public until bids are opened, and that bidders may know only the total allocated funds for the project. After bids are opened, states compare the low bid's unit prices to the estimate under 23 CFR 635.114(c).
What happens if bids come in well over the estimate?
On federal-aid work, the state evaluates bids with extreme variations from the engineer's estimate. If it wants to reject all bids, it needs FHWA concurrence and written justification under 23 CFR 635.114(h). The federal rule sets no fixed overage percentage; that threshold, if any, is state policy. Rejected projects are often re-advertised on a later letting.
Do DBE goals apply to state-funded projects?
49 CFR Part 26 covers only USDOT-assisted contracts. Some states run their own small or disadvantaged business programs on state-funded work, with separate rules. Because Part 26 itself was amended in October 2025 and September 2026, and states such as Minnesota reset project goals in September 2026, check the goal language in each proposal rather than relying on past practice.
