The letter of inquiry for grants used to be the low-stakes step: a two-page introduction you could send to a foundation almost any time, with a full proposal as the real test. That assumption quietly broke. The M.J. Murdock Charitable Trust reported receiving more than 650 letters of inquiry in a single three-month window — a 3.5x increase and the highest volume in the Trust’s 50-year history, with up to 90 submissions arriving daily in December. Foundations are responding by rationing the inquiry step itself, and grantseekers who plan around writing quality alone are missing where the competition now actually happens: getting in the door.

The Inquiry Step Went From Open Door to Rationed Ticket

For years, guidance on the letter of inquiry for grants focused on craft: hook the reader, state the need, name the amount. That advice still holds — our guide to writing a letter of inquiry that gets funded walks through the anatomy — but it assumes the funder is standing at an open door waiting to read. In 2026, the door itself is the constraint.

The Murdock Trust’s public updates are the clearest documented example of a shift program officers across the sector describe privately. In its January message, the Trust noted that a busy day for new inquiries “used to mean 10-15 submissions” before December’s 90-per-day surge. By its June 2026 update ahead of the July submission period, the Trust reported moving forward with only about a quarter of the 350-plus inquiries received in its most recent window — and stated plainly that “a well-prepared, well-aligned submission matters more than ever.”

Two things make this more than one funder’s traffic problem. First, the Trust itself notes the dynamic “is not unique to the Trust” and is affecting philanthropy across the sector. Second, the volume of compelling proposals is outpacing even expanded payout capacity — meaning strong, fundable projects are being declined at the inquiry stage for reasons that have nothing to do with the quality of the letter. When quality stops being the differentiator, mechanics — timing, eligibility, targeting — become the game.

The New Access Mechanics: Windows, Caps, and Cooldowns

The tools funders are using to manage inquiry volume fall into three families, and each one changes how you should plan.

Fixed submission windows. Rather than accepting inquiries year-round, more funders now open the inquiry portal for defined periods. Murdock’s current cycle runs July 1 through August 3, with LOI decisions by September 30 and full applications from approved inquiries due by December 1. Miss the window and your next chance is October 15 — the project waits a quarter, minimum. Windows also compress response expectations: inquiries submitted during a window get batch decisions at the window’s close, not rolling replies.

Submission caps and staggered access. In its March 2026 cycle, Murdock piloted both an LOI cap — once reached, the portal closes regardless of the deadline — and a staggered start that let returning applicants submit a week before new ones. The stagger was dropped for July, but the cap mechanism remains a live tool. A cap converts a deadline into a first-come dynamic: the organizations that had their inquiry drafted before the window opened get in; the ones that started drafting on day one may not.

Resubmission cooldowns. The quiet rule with the longest consequences. At Murdock, a declined inquiry lets you submit a new inquiry for a different project the very next window — but a declined full application triggers a one-year wait, and a funded grant triggers a three-year wait from the award date before your next inquiry. A poorly targeted inquiry that squeaks through screening and then fails at the application stage costs you more access than one that never advanced. Advancing with the wrong project is now worse than not advancing at all.

Your Real Odds, and the Math That Should Shape Your Funder List

A quarter of inquiries advancing is a useful anchor number, but the more important point is what sits behind it: screening is a fit decision, not a writing contest. The Grantsmanship Center’s June 2026 explainer puts it directly — the funder uses the inquiry to screen for fit before investing review time, and “a letter that could have been sent to any foundation is less compelling than one that reflects genuine knowledge of this funder’s priorities.”

That cuts both ways, and the smartest grantseekers use the inquiry as their own screening tool. Before drafting, confirm three things from the funder’s actual behavior, not their mission statement. Check whether organizations like yours — size, geography, program area — appear in their recent awards. Check whether your request amount sits inside their typical grant range. And check their stated process: some funders, like the Doris Duke Foundation, review unsolicited inquiries but award very few grants from them, running most funding through invitation or competitive processes instead. An honest read of that page tells you an unsolicited inquiry there is a long shot worth exactly one afternoon, not a week.

This is where a research pass through a funder directory pays for itself: five funders whose recent grants match your profile will beat twenty approached cold. With windows, caps, and cooldowns limiting how many shots you get per year, list quality is the single highest-leverage decision you make — before a word of the letter exists.

Time the Calendar Before You Write a Word

Under the old regime, the sequence was: find funders, write the inquiry, send when ready. Under rationed access, the calendar comes first. Build a simple funder-by-funder grid with four columns: window dates, decision dates, full-application dates, and cooldown rules. Murdock’s published cycle shows why this matters — an inquiry submitted August 3 gets a decision by September 30, a full application due by December 1, and a grant decision at the April 2027 meeting. That is an eight-month pipeline from inquiry to check, and it only works if the inquiry was ready when the window opened July 1.

Three planning rules follow. First, draft before windows open, not after. Caps reward organizations that treat the window as a submission date, not a writing period. Second, sequence funders so decisions inform each other — a batch decision arriving September 30 can tell you whether to spend October on that funder’s full application or on the next funder’s window. Third, protect your cooldown budget: only let a letter of inquiry for grants advance to full application when the project is genuinely ready, because a declined application can freeze you out of that funder for a year.

Nonprofits juggling several prospects can use our nonprofit grants hub to build the prospect list and a grant database search to track which programs are inside an open window right now versus opening next quarter.

What Still Decides at the Screen: The Signals Reviewers Scan For

None of this replaces substance — it reorders it. When a program officer is triaging hundreds of inquiries in a batch, a handful of scannable signals decide which quarter of the pile advances. Candid’s guidance on what to include in a letter of inquiry lists the load-bearing elements: the amount requested stated plainly in the introduction, a needs statement with specific data for a specific population, a methodology that reads as achievable, and other funding sources named. Note what those have in common — they are all verifiable fit facts, not prose quality.

Add the volume-era signals on top. Follow the funder’s format exactly; reviewers processing hundreds of letters use compliance as a first-pass filter, and an inquiry over the stated page limit may never be read. Name the funder-specific reason you fit — a recent grant of theirs in your program area, a stated priority your project serves. And answer the question the Murdock Trust now points every applicant to: which of the funder’s published focus-area priorities does this project sit inside? Funders that publish eligibility guidelines and priority webinars are telling you the rubric in advance. Treat that material the way federal applicants treat a funding notice: as the source of truth. One more distinction worth keeping straight — the foundation inquiry letter is a different document from the federal letter of intent, which is disappearing; our breakdown of how the letter of intent rules changed covers that split.

Frequently Asked Questions

Do foundations still accept letters of inquiry year-round?

Fewer than before. Many foundations have moved to fixed submission windows — defined periods when the inquiry portal is open, with batch decisions after the window closes. The Murdock Trust, for example, runs three windows a year with published decision dates. Others still take rolling submissions. Check each funder’s application page for current window dates before you plan a submission, because a missed window typically means waiting a full quarter or more.

What share of letters of inquiry actually advance?

It varies by funder and cycle, but recent published data points are sobering: the Murdock Trust advanced roughly a quarter of the 350-plus inquiries in its most recent window, after receiving a record 650 in the window before. High demand means strong projects get screened out on fit and alignment, not just quality — which is why targeting funders whose recent grants match your profile matters more than polishing prose.

How long until I hear back on an inquiry?

Window-based funders usually respond by a published date — Murdock commits to LOI decisions by the end of each three-month cycle. Rolling funders vary: the Doris Duke Foundation says staff respond to inquiries within two months. If a funder states “we will contact you if interested,” silence past the stated period is effectively a decline; move your effort to the next prospect rather than waiting.

Can I resubmit after a declined letter of inquiry?

Read the funder’s resubmission rules — they differ sharply by stage. At the Murdock Trust, a declined inquiry lets you submit a new inquiry for a different project in the next window, but a declined full application requires a one-year wait, and a funded grant requires a three-year wait before the next inquiry. Rules like these mean advancing with a half-ready project can cost you more future access than being screened out early.

Is an unsolicited letter of inquiry still worth sending?

Sometimes — but check the funder’s own numbers first. Some foundations openly state that few grants result from unsolicited inquiries even though staff review them. If the funder’s guidelines invite inquiries and your project matches their recent awards, send one. If they fund primarily by invitation or competitive request-for-proposal processes, put your hours into funders where the inquiry is a real front door.

Bottom Line: Compete for the Slot, Then the Grant

The letter of inquiry for grants is no longer just a writing task — it is a scheduling, targeting, and rationing problem with a writing task inside it. The organizations winning invitations in this environment are not necessarily writing better letters; they are drafting before windows open, matching requests to documented grant patterns, respecting caps and cooldowns, and spending their limited shots on funders whose published priorities they can quote back with a straight face.

Start with the calendar: list your top prospects, pull their window dates and resubmission rules, and work backward so every inquiry is finished before its window opens. Then hold each prospect to the fit test — recent awards to organizations like yours, at amounts like yours. If the stakes justify it, the team behind OpenGrants’ managed grant writing services builds inquiry letters around a specific funder’s screening rubric and calendar, so your best project spends its one shot per cyc