If junior year is exploration, senior year is execution -- your list should already be roughly set, and the real risk now is sequencing, not information. Missing a deadline, or filing something after a school's actual priority date has passed, costs more at this stage than any amount of extra research would gain you. (If you just need the dates themselves without the reasoning behind each one, see our one-table quick-reference version.)
Late summer, before the school year starts
The Common App and most other application platforms open August 1 each year. By this point, based on standard junior-year prep, you should already be well into essay drafts, not starting from scratch. Use these last weeks before classes resume to finalize your list into real reach, target, and safety categories -- see our piece on how many colleges to apply to -- and confirm every school's specific deadlines and supplemental requirements, since these vary a lot more than "everything's due November 1 or January 1."
September-October: setup, not rush time
Treat these weeks as infrastructure, not a scramble. Confirm transcripts and test scores are being sent, finalize supplemental essays for your earliest deadlines, and directly confirm -- don't assume -- that the recommendation letters you requested last spring have actually been submitted. Early Decision and Early Action deadlines commonly fall on November 1 or November 15, so work backward from whichever is earliest on your list. If you're planning one final SAT or ACT retake, October is typically the last sitting whose scores reliably arrive in time for an EA or ED deadline.
October-November: financial aid and early deadlines land together
FAFSA opens October 1 each year -- for the 2026-27 cycle, it actually launched September 24, 2025, ahead of schedule, with a federal deadline that runs all the way through June 30, 2027. That federal date is misleading if you take it at face value: most colleges set their own, much earlier priority deadlines for merit and need-based aid, often in February or sooner, and aid at many schools is awarded on a first-come, first-served basis. File as early as your family's tax information realistically allows, not on the federal timeline. If any target school requires the CSS Profile (common at private colleges), it's a separate form with its own deadlines, frequently aligned with EA/ED dates rather than the FAFSA's. Early Decision and Early Action results typically arrive in mid-December. If you're deferred rather than admitted or denied outright, that's a distinct situation with its own playbook -- see our piece on what actually helps after a deferral.
December-January: the last stretch before Regular Decision deadlines
The December test date is generally the final SAT or ACT sitting whose scores reliably land before Regular Decision deadlines. Most Regular Decision deadlines fall on January 1 or shortly after, but confirm your specific schools' actual dates -- "January 1" isn't universal. This is also when remaining financial aid paperwork needs to be wrapped up; many schools want FAFSA and CSS Profile submissions finalized by January or February for full consideration, a separate clock from the admissions deadline itself.
February-April: mostly waiting, but not fully checked out
This stretch is largely a waiting period, but it's exactly the window where a real senior-year grade drop can matter -- schools that admit you are watching your final transcript, and admission is conditional, not locked in the moment you get the good news. See our piece on whether a senior-year GPA drop can actually cost you your admission for what genuinely triggers a problem versus what doesn't. Regular Decision results typically arrive in March. If the outcome is a waitlist rather than an admit or a deny, that's a meaningfully different mechanism from a deferral, with its own strategy -- see our piece on how to actually play a waitlist.
May 1: the date that actually closes the loop
The National Candidates Reply Date, May 1, is the conventional deadline -- set by longstanding NACAC practice, not federal law -- to formally accept one offer and pay a nonrefundable deposit, commonly $200 to $500. If you're still waiting on a waitlist decision anywhere, deposit somewhere you'd genuinely attend by May 1 regardless -- this is standard, expected practice, not bad faith, since waitlist movement at most schools doesn't even begin until they see how their own May 1 deposits came in. Not every school holds to May 1 exactly: CUNY, for example, has pushed its own commitment deadline to June 1 in recent cycles specifically to give students more time to weigh financial aid offers -- so check whether any of your specific schools have moved the date before assuming May 1 applies everywhere.
What this means for you
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Work backward from your earliest real deadline -- usually an EA or ED date in November -- rather than treating August through January as one undifferentiated block of time.
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File FAFSA, and CSS Profile if required, as early as realistically possible. College-specific aid deadlines are almost always earlier than the federal cutoff, and aid at many schools is genuinely first-come, first-served.
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Confirm, don't assume, that recommendation letters and test scores have actually arrived at each school. A missing piece is an easy fix in October and a real problem in December.
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Keep your grades and course rigor steady through the spring. Admission at nearly every school is conditional on your final transcript, not locked in the moment you're admitted.
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Deposit somewhere you'd genuinely attend by May 1 no matter what else is pending, and check whether any of your specific schools have pushed that date later before assuming the standard deadline applies.
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This is one step in the larger process, not a standalone task -- see the complete step-by-step guide to applying to college for how it fits with everything else, and where you are in the sequence.