CDCR - California State Prison, Solano (SOL)

California State Prison, Solano (CSP-SOL) in Vacaville is a medium-security CDCR institution in Solano County, about halfway between the Bay Area and Sacramento. For families across Northern California, its central location makes it more accessible than many California prisons. Solano offers three-day-a-week visitation, which is more than the typical weekend-only schedule at CDCR facilities, and this guide brings the visitation, mail, money, and general CDCR essentials together.

About CSP-Solano

Opened in 1984, CSP-Solano houses about 3,000 medium-security men in Vacaville, and it plays an important role in California's system as a facility with substantial programming, education, and vocational opportunities. Its location between the Bay Area and Sacramento means many families can drive to visit in a manageable trip. Every incarcerated person is identified by a CDCR number that follows them through the whole state system, so writing it down early is essential.

Because California moves people between institutions as their classification changes, confirming exactly where your person is held before every visit or mailing is the habit that saves the most frustration. Our guide on how to find someone in jail or prison explains how to trace an incarcerated person through California's CIRIS system, and you can search their name directly on AllRecentArrests.us to see their institution and status. Treat the CDCR number rather than the current address as the constant you build everything around.

Visitation process and hours

Visiting at CSP-Solano is more generous than at many California prisons: Friday hours run from 1:00 p.m. to 8:00 p.m., and Saturdays and Sundays run 8:00 a.m. to 3:00 p.m. Before you can visit, you must be approved and added to the inmate's visiting list — this starts with CDCR Form 106 (Visitor Questionnaire) that the inmate sends to you and signs before you complete and return it for a background check. Firm dress code rules are enforced at the gate, and personal belongings generally cannot be taken into the visitation area.

The visiting hotline at (800) 374-8474 is a good resource for confirming schedule details before a trip. Our complete prison visitation guide covers approval, dress codes, and what to expect at the checkpoint. Bring only your government-issued photo ID and the small amount of money California allows for vending machines — the visiting-room rules are strictly enforced, and a wasted drive to Vacaville is a hard lesson.

How to send money through CDCR

Money for a California inmate is deposited electronically through JPay or Access Secure Deposits, or by mail to the CDCR lockbox. Look up the person's CDCR number using CIRIS (California Incarcerated Records and Information Search), and use it on every deposit. The California-wide rule to plan around is that CDCR is required to garnish 50 percent of any non-exempt deposit toward restitution the person owes, so if your loved one has a restitution obligation, only half of what you send may reach their spendable account. Money follows a person across CDCR transfers, so deposits made at one institution are not lost if your loved one is moved.

Our overview of how to send money to an inmate compares options and posting times, and our dedicated JPay guide and Access Corrections guide walk through the two electronic services California uses. Sending a modestly larger amount less often usually beats many small deposits that each carry a fee.

California's mail rules

All mail must arrive via USPS and is examined for contraband. Address every letter to the inmate's full name, CDCR number, and current housing information. California prohibits an extensive list of items in personal mail (cash, personal checks, stamps, stickers, glitter, glue, tape, staples, paperclips, Polaroids, hardcover books, musical or embellished cards, anything with electronics), so stick to plain white paper in blue or black ink. Books and publications must generally come directly from the publisher. Our breakdown of how to send mail to an inmate covers the general address format and common rejection triggers. Legal mail from a court or attorney is handled separately and more protectively under California rules.

Phone calls, packages, and staying connected

Phone service at CSP-Solano lets the incarcerated person place calls to numbers on their approved list, so set up and fund a prepaid account tied to your number. Note that CDCR moved to free calls for incarcerated people as of January 1, 2023, which means the caller-side cost of receiving calls has dropped dramatically — our guide to calling an inmate explains account setup. California allows packages only through approved vendors, so the way to send goods is to order through an approved vendor or fund the canteen so your loved one can buy for themselves. Our guide to sending a care package to an inmate explains how approved-vendor ordering works, and our explainer on how prison commissary works shows what a funded account buys.

Legal mail, emergencies, and avoiding scams

Legal or privileged mail from an attorney or a court is opened only in the incarcerated person's presence and is not read the way personal mail is, provided it is properly marked, so keep legal documents out of personal letters. For emergencies such as a death, serious illness, or birth, call the facility to arrange getting an urgent message through, and keep the CDCR number handy. If you are worried about a loved one's medical care, mental health, or safety inside, contact staff directly, explain the situation clearly, and keep a written record of who you spoke with and when.

Be cautious about paying third-party sites — the CDCR inmate search and the department's named providers are the authoritative channels, so paying an unfamiliar site to "locate" a person or forward a deposit is a common way families lose money for something the state provides free. When guidance you read online conflicts with what the facility tells you, trust the facility, and confirm anything important by calling (707) 451-0182 first.

Staying consistent and preparing for release

Whatever mix of visits, calls, and letters you settle into, consistency matters more than any single grand gesture, and steady support is one of the most valuable things a family can offer someone inside. A predictable rhythm gives the person something reliable to count on through a hard stretch. As a release date approaches, preparation pays off: our reentry guide for life after prison covers those first steps, our guide to finding work after prison addresses fair-chance hiring, and many returning citizens qualify for help through SNAP, Medicaid, and TANF soon after release. If you are supporting a household through an incarceration, our overview of financial help for families of incarcerated people lists resources that can ease the strain.

Working with Solano's flexible schedule

The Friday-through-Sunday visiting schedule at CSP-Solano is a real advantage for working families in Northern California. A Friday evening visit (1:00-8:00 p.m.) fits after work in a way that weekend-only schedules cannot, and it can turn what would be a whole-weekend trip into a Friday evening plus a Saturday morning visit. Coordinating with your loved one about which days work best given his program schedule maximizes the time. Because the Vacaville drive can be manageable from the Bay Area or Sacramento, consistent visits are within reach for many families.

Solano's program offerings include education, vocational training, and various work assignments, so encouraging your loved one to engage with what is available — and asking him what programs he's in when you visit — is one of the more meaningful ways families can support the sentence. Program completion often affects parole review and post-release opportunities.

Records and staying steady

Keeping the CDCR number, current housing, JPay or Access receipts, and any court or parole hearing dates organized carries families through CSP-Solano with the least added friction. Above all, steady contact through calls (which are free since January 2023), plainly addressed letters, and weekend visits is one of the most valuable things you can offer someone across a Solano sentence.

Health, safety, and long-term support

If you are worried about a loved one's medical care, mental health, or safety at CSP-Solano, contact staff directly rather than assuming word will reach the right person informally. Explain the situation clearly, keep the CDCR number handy, and maintain a written record of who you spoke with and when. A calm, specific account gets a faster response than an emotional one, and documented calls make follow-up easier if the initial response does not resolve the concern. Be cautious about paying third-party sites — the CIRIS locator, JPay, and Access Corrections are the authoritative channels, so paying an unfamiliar site is a common way California families lose money for something the state provides free.

Above all, remember that steady, informed support across a Solano sentence is one of the most valuable things a family can offer. The combination of free calls, three-day-a-week visiting, and multiple deposit options makes staying connected genuinely achievable, and building consistent routines early sets the foundation for the length of the sentence.

Inside California State Prison, Solano: how the facility is laid out

California State Prison, Solano has been in operation since 1984. The population is split across four separate semi-autonomous facilities, which is the detail that most often explains why two people at the same address live under different visiting, phone, and movement rules.

Solano states that it provides a comprehensive work and training program combining academic education, vocational training and industries assignments, aimed at giving people work skills and education.

Layout matters more than families expect. Which yard or unit someone is assigned to drives their custody level, their program eligibility, and often their visiting schedule — so when you call, having the housing assignment to hand will get you a useful answer faster than the name alone.

How crowded California State Prison, Solano is right now

California State Prison, Solano was designed to hold 1,904 people. As of July 22, 2026 the agency reported a population of 2,650, which is 139.2% of that design capacity.

A prison operating at this level is not simply full — it is well past the number it was built for, and that shows up in the things families actually feel. Expect converted dayrooms and gymnasiums used as housing, long waits for medical and dental appointments, program and education waitlists, and visiting slots that fill early. It also drives transfers: when one institution is over capacity, people get moved to wherever there is a bed, sometimes hundreds of miles away.

For scale, the same report puts the state's institutions as a whole at 86,006 people against a design capacity of 71,074, or 121.0% — so this facility sits above the system-wide figure rather than being an outlier.

This figure moves week to week. Treat it as the scale of the place rather than a live count, and confirm anything that affects a visit with the institution directly.

What makes California State Prison, Solano different

California State Prison, Solano does not operate as an ordinary general-population prison. Its designated role is segregation and clinical housing alongside general population, and that changes what you should expect from it.

The institution operates 125 licensed Administrative Segregation Unit beds and 16 licensed Correctional Treatment Center beds. Licensed bed counts matter because a licensed unit runs under health-care rules rather than ordinary custody rules: admission is a clinical decision, not a classification one, and visiting and phone access on those units can differ from the rest of the facility.

If your family member is here for a medical or mental-health reason rather than a custody one, ask specifically which unit they are on. That single answer determines their visiting schedule, their phone access, and who you need to speak to about their care.

Who runs California State Prison, Solano

The senior official on site is Acting Warden Andre Gonzales. Naming the warden is not just trivia: correspondence about a serious unresolved problem should be addressed to that post rather than to the institution generally, because a letter to a named office creates a record that a call to a switchboard does not.

The institution's main line is (707) 451-0182. Use it for anything urgent — a medical emergency, a safety concern, confirming whether visiting is running — and ask for the watch commander or the shift supervisor rather than leaving a message with whoever answers.

Education, training, and work at California State Prison, Solano

Academic programming at California State Prison, Solano includes Adult Basic Education, GED, a literacy program, a college program and the Voluntary Education Program. Enrolment is rarely immediate — most institutions run waitlists, and assignment depends on custody level, sentence length, and prior testing. If your family member wants a place, the request has to come from them through their assigned counsellor; a call from outside will not add someone to a list.

Vocational and career technical training on site includes Carpentry, Fiber Optics, Masonry, Building Maintenance, Office Services and Related Technology, Computer Literacy, Residential Electrical and Welding. These carry more weight than general programming, because completion is documented and can matter at a parole or release review as evidence of work done inside.

The facility also operates prison industry work assignments: a book bindery, laundry, metal fabrication and optical. These are paid positions, at correctional pay rates rather than market wages, and the earnings usually route into a trust account your family member can spend at the commissary. A work assignment is also the most common reason someone becomes hard to reach during the day.

Visiting California State Prison, Solano: the current schedule

California State Prison, Solano receives visitors on Friday, Saturday and Sunday, with in-person visits offered for a minimum of two hours, though the exact session length varies by institution and availability.

Two things about that schedule are worth knowing before you drive. Published hours are when the visiting room is open, not when you can arrive — processing closes well before the room does, and arriving inside the last hour often means being turned away. And a published schedule is suspended more often than it is changed: lockdowns, staffing shortages, and medical isolation all cancel visiting at short notice, usually without the website being updated.

Visiting is booked through the department's Visitation Scheduling Application. The booking window opens eight days before the visit and closes five days before it, and the daily request period opens at 6:00 a.m. for northern institutions, 6:30 a.m. for central, and 7:00 a.m. for southern, running to 11:59 p.m. Only people already approved as visitors can book an appointment, so the approval application has to be completed and granted before any date can be reserved. Visits can be cancelled at any time for health and safety reasons, and can be ended early if staff see a visitor or a resident showing symptoms of a contagious illness.

Call the institution the morning you travel and ask specifically whether visiting is running on your family member's yard or unit — not whether the prison is open. Those are different questions, and the second one gets a misleadingly reassuring answer.

Your first steps

If someone you love has just arrived at CSP-Solano, focus first on the essentials: write down their CDCR number, complete the Visitor Questionnaire (Form 106) and get approved so you can visit Friday through Sunday, and set up a JPay or Access deposit knowing California withholds 50 percent for restitution. Keep letters to plain white paper with none of the many prohibited items, and rely on CDCR's own tools rather than paid third-party sites.

The combination of Solano's central California location and its Friday-through-Sunday schedule is one of the most family-accessible arrangements in the CDCR system, so if your loved one is here, take full advantage.

Even small habits — a saved JPay login, a printed template for CDCR mail addressing, a family calendar with agreed visit days — carry Solano families through the length of a sentence with the least added stress across California's central valley.