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National Rate Trends

Best 3/1 Jumbo ARM Rates March 2026 | As Low As 5.13%

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Brian McKay Brian McKay
Brian McKay

Brian McKay

Founder & Data Architect
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Brian is the Founder of MonitorBankRates.com. For over 18 years, he has utilized his background in enterprise infrastructure to engineer proprietary systems that track rates from over 8,000 financial institutions.
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| iEditorial Disclosure
Editorial Disclosure The rates displayed are actual, verified rates sourced directly from the official websites of lenders. Our editorial content is independent of any advertiser relationships.
| ✓Fact Checked | Last Updated: March 21, 2026

Today's 3/1 Jumbo ARM mortgage market includes offers such as Sharon And Crescent United Credit UnionSharon And Crescent United Credit Union100 Forbes Blvd, Brockton, MA 02032 1018A+5.0 ★Texas Ratio: 3.02% offering Jumbo Loans - Adjustable Rate First Mortgages (ARM) at 5.12%.

A 3/1 jumbo ARM is an adjustable-rate mortgage for high-balance loan amounts above conforming limits with a fixed rate for the first 3 years. It offers the lowest initial rate of any jumbo product, making it a compelling option for borrowers with a short defined ownership horizon on a higher-priced property.

3/1 Jumbo ARM rates reflect the initial fixed-rate period. Jumbo ARM rates will adjust after 3 years based on market conditions. Last Updated and Verified: March 21, 2026

Compare 3/1 Jumbo ARM Rates Today

State:
Today's 3/1 Jumbo ARM Rate Context: The national average 3/1 jumbo arm mortgage rate is 6.288%. The table below shows verified 3/1 jumbo arm rate offers from banks and credit unions nationwide. Source: Verified Mortgage Rate Data provided by MonitorBankRates.com.
Source: Verified Mortgage Rate Data provided by MonitorBankRates.com
Lender
Product
Term
Rate ▲
APR
Profile
Sharon And Crescent United Credit Union
Institution Rating:
A+5.0 ★Texas Ratio: 3.02%
Brockton, MA
Jumbo Loans - Adjustable Rate First Mortgages (ARM)
3/1 Years (30 Years)
5.12%
5.99%
View
▼
Rate5.12%
APR5.99%
Points0.000
UpdatedMar 21, 2026
Details

No additional details available.

The 3/1 jumbo ARM rates displayed are verified and sourced directly from the official websites of the listed financial institutions. Jumbo ARM rates will adjust after the initial fixed period.

Banks and Credit Unions: If you need to update your rate data or request removal from MonitorBankRates.com, please contact us here.

3/1 Jumbo ARM Rate Trend

Daily national average rates across all mortgage types

Daily mortgage rate averages compiled from our database of 8,500+ banks and credit unions — updated daily.

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3/1 Jumbo ARM — National Avg
6.288%

The national 3/1 Jumbo ARM rate currently averages 6.288% from 8,500+ lenders.

Quick Reference — March 2026
Est. payment ($400k loan): $2,473/mo
Loan type: 3/1 Jumbo ARM (adjustable after 3 years)
Best for: Lower initial rate on jumbo loans, short-term
Data source: 8,500+ lenders verified daily
As of Mar 24, 2026 • Daily averages from our database of 8,500+ U.S. banks & credit unions — updated daily Powered by MonitorBankRates

Jumbo ARM Mortgage Calculators

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Methodology & Data Sources

Direct-Sourced & Verified Rate Data: Every 3/1 jumbo ARM rate on this page is sourced directly from the official website of the lending institution. Jumbo ARM rates reflect the initial fixed-rate period and are verified and updated daily.

Nationwide Lender Coverage: Our database monitors over 8,500 banks and credit unions across all 50 states, capturing a diverse mix of community credit unions, regional banks, and national online lenders. This breadth ensures you see competitive rates that many national rate surveys miss.

Time-Stamped for Full Transparency: Because 3/1 Jumbo ARM rates can shift multiple times per week in response to economic conditions and Federal Reserve policy changes, every rate entry carries its own specific "last updated" date. You always know exactly how fresh the data is.

Proprietary Lender Safety Ratings: Rate alone is only part of the picture. MonitorBankRates evaluates the financial stability of every listed institution using regulatory FDIC and NCUA data. Our composite Health Grades (A+ to F), Star Ratings, and Texas Ratio calculations give you a clear view of lender stability so you can borrow with confidence from a financially sound institution.

Frequently Asked Questions About 3/1 Jumbo ARM Rates

What is a 3/1 Jumbo ARM?

A 3/1 Jumbo ARM is an adjustable-rate mortgage on a loan that exceeds the conforming loan limit (currently $766,550 in most U.S. counties) with a three-year initial fixed-rate period. For the first 36 months, the interest rate stays the same. After that, the rate adjusts once per year based on a financial index — typically SOFR — plus a lender margin. The 3/1 offers the lowest initial rate of the jumbo ARM options, but also the shortest window of rate certainty.

What qualifies as a jumbo loan?

A jumbo loan is any mortgage that exceeds the conforming loan limits set annually by the Federal Housing Finance Agency (FHFA). In most U.S. counties, the 2024 single-family limit is $766,550. In designated high-cost areas such as parts of California, New York, and Hawaii, higher limits apply — up to $1,149,825. Loans above these thresholds cannot be purchased by Fannie Mae or Freddie Mac, so lenders retain more risk and typically require stronger borrower qualifications.

How does the rate adjustment work after the 3-year fixed period?

After the initial 3-year fixed period, the rate adjusts annually. Each adjustment is tied to a financial index — most commonly the Secured Overnight Financing Rate (SOFR) — plus a fixed margin set by the lender (typically 2.5%–3.0%). For example, if SOFR is 4.50% and the margin is 2.75%, your new rate would be 7.25%, subject to any applicable rate caps. The first adjustment and each subsequent annual adjustment are capped to limit payment shock.

What are rate caps on a 3/1 Jumbo ARM?

Rate caps limit how much the interest rate can increase at each adjustment and over the life of the loan. A typical 3/1 Jumbo ARM has a 2/2/5 cap structure: the first adjustment cannot exceed 2% above the initial rate, subsequent annual adjustments are capped at 2%, and the lifetime cap is 5% above the start rate. So if your initial rate is 6.00%, your rate can never exceed 11.00% regardless of index movements. Always confirm the specific cap structure with your lender.

Who is a 3/1 Jumbo ARM best suited for?

The 3/1 Jumbo ARM is best suited for borrowers who are confident they will sell or refinance the property within three years. Common scenarios include buyers purchasing a home that is a planned short-term primary residence, investors acquiring luxury or high-value properties with a clear exit strategy, and move-up buyers who anticipate selling their current home within a few years. The 3-year window is short, so this loan carries meaningful rate risk for anyone who stays beyond the fixed period.

What are the typical borrower requirements for a jumbo ARM?

Jumbo ARMs carry stricter qualification standards than conforming loans. Most lenders require a minimum credit score of 700–720, with the best rates typically reserved for scores above 740 or 760. Down payment requirements generally start at 10%–20% depending on loan size. Lenders also scrutinize debt-to-income (DTI) ratios more closely, typically capping at 43%, and often require 12–24 months of cash reserves (mortgage payments) in liquid assets after closing.

How does a 3/1 Jumbo ARM compare to a 5/1 or 7/1 Jumbo ARM?

The key trade-off across jumbo ARM terms is rate versus certainty. The 3/1 offers the lowest initial rate of the three options, but rate adjustments begin sooner. The 5/1 provides two additional years of rate certainty for a slightly higher starting rate, while the 7/1 offers the most protection of the ARM options, with seven years fixed, at the highest initial rate of the three. If you are certain you will exit the loan within three years, the 3/1 makes the most financial sense. If your timeline is uncertain, a longer fixed period is generally worth the modest rate premium.

What is the difference between interest rate and APR on a jumbo ARM?

The interest rate is your initial borrowing cost for the fixed period. The APR (Annual Percentage Rate) on an ARM is calculated differently than on a fixed loan — it must account for the projected rate changes after the fixed period based on current index levels, plus lender fees and points. Because the APR reflects assumed future rate adjustments, two ARMs with the same initial rate can have different APRs. The APR is still a useful tool for comparing total cost across lenders, but understand it is based on assumptions about future rate movements.

How are 3/1 Jumbo ARM rates determined?

Lenders price 3/1 Jumbo ARM rates primarily based on the 3-year U.S. Treasury yield and the SOFR index, adding a spread to cover credit risk, jumbo loan risk premium, servicing costs, and profit margin. Because jumbo loans are held on lender balance sheets rather than sold to Fannie Mae or Freddie Mac, lenders have more pricing flexibility and risk exposure, which can cause jumbo ARM rates to diverge from conforming ARM rates. Your specific rate also depends on credit score, loan-to-value ratio, property type, and loan size.

What are today's best 3/1 Jumbo ARM rates?

  • Sharon And Crescent United Credit Union: 5.12% (Jumbo Loans - Adjustable Rate First Mortgages (ARM))
30-Year Fixed rates reflect actual verified offers from lenders actively lending to borrowers nationally. Your final approved rate will depend on your credit profile, loan-to-value ratio, and daily market movements. Last Updated: March 21, 2026

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