Top 10 Private High Schools in Seattle in 2027

The two front-runners, side by side

The Seattle private-school market splits cleanly into two tiers, and the two schools at the top of each tier are the ones most families actually end up choosing between. Lakeside School sits in north Seattle, enrolls roughly 850 students across grades 5 through 12, and charges approximately $44,000 per year before aid. Seattle Preparatory School sits on Capitol Hill, enrolls roughly 750 students in grades 9 through 12 only, and charges approximately $23,000 per year before aid. That is a spread of about $21,000 annually — roughly $84,000 across four years of high school for a single student, and roughly $168,000 for two siblings.

What the extra money buys at Lakeside is measurable in a few specific places. The student-teacher ratio runs near 9:1, which supports seminar-style classes where a junior-year humanities section might hold twelve students around a table rather than twenty-eight in rows. Average SAT scores run well above 1400. Matriculation is near-universal to four-year colleges, with a heavy concentration at Ivy League schools, Stanford, MIT, and the top-tier liberal arts colleges. The endowment supports a need-based financial aid program that reaches roughly a quarter of the student body, which materially changes the effective price for families under the aid threshold. Lakeside is also the most selective admit in the Pacific Northwest — applying is not the same as enrolling, and families should treat acceptance as genuinely uncertain rather than a formality.

What Seattle Prep delivers for half the price is a graduation rate near 99%, strong AP participation across the curriculum, average SAT scores near 1280, and heavy enrollment in selective four-year colleges. The Jesuit framework adds service-learning requirements and faith formation that some families rank as a primary reason to enroll and others rank as a reason to look elsewhere. Class sizes are larger than the small independents — closer to a conventional high school section than a twelve-person seminar. Need-based aid is robust and drawn from parish, donor, and archdiocesan sources, which means the effective tuition for a middle-income family can drop well below the $23,000 sticker.

The honest framing: Lakeside buys a smaller, more selective, more heavily resourced environment with a stronger elite-college pipeline. Seattle Prep buys a strong, values-anchored college-prep education at a price a two-income Seattle household can absorb without restructuring its finances. Neither is a mistake. The gap in raw outcomes between them is smaller than the gap in price.

The eight other schools worth a real look

Restricting the decision to two schools is a mistake if your student has a specific profile. Eight other Seattle-area private high schools have distinct, defensible cases.

The Bush School in Madison Valley enrolls about 650 students across grades K through 12 at roughly $42,000 per year. Its model is progressive and inquiry-based — discussion-driven classes, experiential learning, and outdoor programs. Student-teacher ratio runs around 8:1 and average SAT scores sit near 1350. It is the right answer for a student who does well when asked to construct an argument and the wrong answer for a student who wants structure and clear rubrics.

Seattle Academy of Arts and Sciences on Capitol Hill enrolls about 800 students across grades 6 through 12 at roughly $43,000. SAAS pairs solid academics — average SAT near 1320, ratio around 8:1 — with performing arts, visual arts, and athletics programs that rank among the strongest in the city's independent sector. The urban campus limits outdoor space, which matters if your student is a field-sport athlete.

University Prep in northeast Seattle enrolls about 600 students in grades 6 through 12 at roughly $43,000, with a ratio near 8:1 and average SAT near 1330. Its distinguishing features are advising density and global travel programs. Athletics offerings are thinner than at SAAS or the Catholic schools.

The Northwest School downtown enrolls about 500 students across grades 6 through 12 at roughly $42,000, ratio near 8:1, average SAT near 1300. Its curriculum is globally oriented, environmentally focused, and arts-rich, with a genuinely international student community — a strong fit for a student who wants that specific lens and a poor fit for one who wants a big athletics program.

On the Catholic side, O'Dea High School on First Hill enrolls about 500 boys in grades 9 through 12 at roughly $20,000, in the Christian Brothers tradition, with a graduation rate near 98%, solid AP participation, and strong athletics. Holy Names Academy on Capitol Hill enrolls about 700 girls in grades 9 through 12 at roughly $21,000 — Seattle's oldest continuously operating school — with a graduation rate near 99%, high AP participation, average SAT near 1290, and well-regarded STEM and leadership programming. Eastside Catholic School in Sammamish enrolls about 900 students across grades 6 through 12 at roughly $22,000, coed, with a graduation rate near 99% and competitive athletics; it is the practical choice for Eastside families who do not want a daily cross-lake commute.

Forest Ridge School of the Sacred Heart in Bellevue enrolls about 400 girls across grades 5 through 12 at roughly $38,000 — priced like an independent rather than a parish school — with a ratio near 8:1, average SAT near 1300, and access to the global Sacred Heart network of affiliated schools.

How to decide between them

The decision is not a ranking lookup. It is a sequence of filters, applied in order, and most families can narrow ten schools to two or three in a single evening.

Start with geography, because it is the constraint that does not negotiate. A Sammamish family sending a student to Lakeside is looking at a commute that can exceed an hour each way in Seattle traffic, twice a day, for four years. That is real time removed from sleep, homework, and sport. Eastside Catholic and Forest Ridge exist precisely because that commute is unsustainable for many households.

Second filter: faith-based or secular. This is binary for most families and eliminates half the list immediately. Third: coed or single-gender — O'Dea, Holy Names, and Forest Ridge are out if your student won't consider it, and are the primary draw if they will.

Fourth: budget after aid, not sticker price. Run the aid estimator or request a preliminary award before you eliminate a school on price. A family earning $150,000 in Seattle may find that Lakeside's award brings its net cost within a few thousand dollars of Seattle Prep's sticker — or may find it doesn't. You cannot know without applying.

Fifth and last: program fit. Arts point to SAAS or Northwest. Progressive pedagogy points to Bush. Athletics point to Eastside Catholic or O'Dea. Advising density points to University Prep. Maximum academic rigor points to Lakeside.

The concrete numbers behind each tier

Pricing across the Seattle private high school market clusters into three bands, and knowing the bands prevents sticker shock and prevents overpaying.

The secular independent band runs roughly $42,000 to $44,000 per year: Lakeside at about $44,000, Seattle Academy at about $43,000, University Prep at about $43,000, The Bush School at about $42,000, The Northwest School at about $42,000. Four years at the midpoint is roughly $172,000 before aid. Add the line items schools do not put on the tuition page — books, technology fees, athletic participation fees, class trips, and for the schools with strong travel programs, international trip costs that can run into four figures per trip. Budget an additional 5% to 10% above tuition for a realistic all-in number.

The Sacred Heart band is its own case: Forest Ridge at about $38,000 sits between the independents and the parish-supported Catholic schools, reflecting its independent governance within a global network.

The Catholic band runs roughly $20,000 to $23,000: O'Dea at about $20,000, Holy Names at about $21,000, Eastside Catholic at about $22,000, Seattle Prep at about $23,000. Four years at the midpoint is roughly $86,000 before aid — less than half the independent band.

On outcomes, the numbers compress far more than the prices do. Graduation rates cluster near 98% to 99% across Seattle Prep, O'Dea, Holy Names, and Eastside Catholic. Average SAT scores run from about 1280 at Seattle Prep to about 1350 at Bush, with Lakeside standing apart above 1400. Student-teacher ratios sit around 8:1 at the small independents and near 9:1 at Lakeside. Every school on this list sends the large majority of its graduates to four-year colleges.

The practical read: you are paying roughly double for a 60-to-120-point average SAT difference and a denser elite-college pipeline. For some students that pipeline is decisive — a student targeting a highly selective research university benefits from a college counseling office with established relationships and a track record admissions officers recognize. For many students it is not, and the $86,000 difference redirected into a college fund is the better allocation.

Financial aid changes all of this. Lakeside supports roughly a quarter of its students with need-based aid. The Catholic schools widen access through parish and donor funds. Aid is need-based rather than merit-based at these schools as a rule, which means the process runs on documented financial position rather than test scores. File early, file complete, and apply to more schools than you think you need — awards vary meaningfully between schools for identical financials.

How to run the application year without losing the schedule

Private high school admission in Seattle runs on a compressed and largely fixed calendar, and the families who struggle are almost always the ones who started in December.

Begin the September of eighth grade — roughly fifteen months before enrollment. Attend open houses through October and November; most schools run them in that window and they are the cheapest way to eliminate a school. Send your student to shadow days where offered; a full day inside the building tells you more than three tours.

Standardized testing is the piece with the least schedule flexibility. Most Seattle independents use the ISEE or SSAT. Register in the fall for a fall or early-winter test date, and register early — Seattle-area seats fill. Build in a retake window before the application deadline in case the first score comes back low.

Applications generally close in December or January for the following September. Each one wants transcripts, teacher recommendations from current math and English teachers, a student essay or writing sample, and a parent statement. Give teachers at least three weeks of notice and hand them the forms and deadlines in writing — a late recommendation delays the whole file.

Financial aid runs on a parallel track with its own deadline, frequently earlier than the admissions deadline. Most schools use a third-party need assessment service and will also want tax returns and W-2s. Missing the aid deadline usually does not disqualify the application, but it can push the family into a smaller second-round pool. Treat the aid deadline as the real deadline.

Interviews happen in January and February. Decisions and aid awards typically arrive in early to mid-March, with enrollment contracts and deposits due within a few weeks. That short window is why applying to a range of schools matters: with three or four offers in hand you can compare net cost side by side, and in some cases go back to a school to ask it to review an aid award against a competing offer.

What matters less than the marketing suggests

Three signals get more weight from families than the evidence supports. The first is brand name. A school's reputation reflects decades of accumulated results and says less than families assume about what a specific student will experience in a specific classroom in a specific year. The second is facilities. A new athletic center or science wing is visible on a tour and is largely uncorrelated with teaching quality. The third is average SAT score in isolation — it is heavily driven by who the school admits, not by what the school adds.

What deserves more weight: faculty tenure and turnover, which you can ask about directly and which predicts whether the teachers you meet on a tour will still be there in your student's junior year. College counseling caseload — the number of students per counselor — which determines how much individualized attention the application year actually receives. And the school's response when you ask a hard question about a weakness; the ones that answer candidly generally treat parents the same way once enrolled.

One reframe worth holding onto: a private high school is a four-year operating expense, and like any recurring expense it should be evaluated against the outcome it produces rather than the prestige it signals. Families who run the decision the way an operator runs a revenue line — comparing net cost against measurable return, checking assumptions against reported data rather than reputation — consistently make better choices than families who anchor on the top of a ranking list. That framing does not make the decision cold; it makes it defensible when the tuition invoice arrives every August for four straight years.

Related questions

Does attending Lakeside meaningfully improve Ivy League odds?

It correlates with higher elite-college enrollment, but Lakeside also admits an unusually strong applicant pool, so part of that outcome reflects selection rather than the school's added value. The established counseling relationships and recognized transcript are real advantages; they are not a guarantee.

Can a family earning a middle income realistically afford Lakeside?

Possibly. Lakeside's need-based aid reaches roughly a quarter of students, and awards are calculated on documented financial position. The only way to know your number is to apply for aid. Do not self-eliminate on the $44,000 sticker before seeing an award.

Is the Eastside worth considering for a Seattle family?

Only if the commute works. Eastside Catholic in Sammamish and Forest Ridge in Bellevue are strong schools, but a daily cross-lake commute from Seattle costs a student hours each week that would otherwise go to sleep, homework, or sport.

How many schools should a student apply to?

Three to five is the practical range. Fewer leaves you without a net-cost comparison in March; more overloads teacher recommenders and the student's essay-writing capacity, and multiplies application fees without improving the odds meaningfully.

Do Catholic schools require families to be Catholic?

Generally no. Seattle Prep, O'Dea, Holy Names, and Eastside Catholic enroll non-Catholic students. All students participate in the religious and service-learning components of the curriculum, which is the real question for a non-Catholic family to weigh.

FAQ

Which private high school in Seattle is the strongest overall for 2027?

Lakeside School, on the combined strength of its rigor, its near-9:1 student-teacher ratio, average SAT scores above 1400, and near-universal matriculation to four-year colleges with heavy representation at the most selective universities. It is also the hardest admit in the region, so treat acceptance as genuinely uncertain.

Which one delivers the best value?

Seattle Preparatory School. A graduation rate near 99%, strong AP participation, and average SAT scores near 1280 at roughly $23,000 per year — about half the secular independent band — plus need-based aid drawn from parish and donor sources. Over four years the difference against a $44,000 school approaches $84,000.

What does private high school actually cost in Seattle?

Secular independents run about $42,000 to $44,000 per year; Catholic schools run about $20,000 to $23,000; Forest Ridge sits between at about $38,000. All figures are before aid. Add 5% to 10% for books, technology, athletic fees, and trips to reach a realistic all-in number.

Which schools are strongest for the arts?

Seattle Academy of Arts and Sciences leads on performing and visual arts, with programs among the strongest in the city's independent sector. The Northwest School offers an arts-rich curriculum inside a globally focused, environmentally oriented program — a different flavor of the same strength.

What single-gender options exist in the Seattle area?

O'Dea High School is all-boys in the Christian Brothers tradition at about $20,000. Holy Names Academy is all-girls at about $21,000 with strong STEM and leadership programming. Forest Ridge School of the Sacred Heart in Bellevue is all-girls at about $38,000 with access to a global affiliated network.

When should a family start the application process?

September of eighth grade. Open houses run October through November, ISEE or SSAT testing runs fall through early winter, applications close December or January, financial aid deadlines often fall earlier than admissions deadlines, and decisions with aid awards arrive in early to mid-March.

Sources

• Niche — Best Private High Schools in the Seattle Area
• Private School Review — Washington private schools
• U.S. News — Education, K-12
• Lakeside School
• Seattle Preparatory School
• The Bush School
• Seattle Academy of Arts and Sciences
• Holy Names Academy
• Eastside Catholic School
• The Seattle Times — Education Lab

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