Windsor Entry Requirements

Visa, immigration, and customs information

Windsor is a town in Sonoma County, California, United States. As Windsor is located within the United States, all travelers visiting Windsor must comply with U.S. federal entry requirements. Whether you're arriving by air through nearby airports such as Charles M. Schulz–Sonoma County Airport, San Francisco International Airport, or Oakland International Airport, or entering by land from Canada or Mexico, you'll need to clear U.S. Customs and Border Protection. The United States operates a visa waiver program for certain nationalities, while others require visas or electronic travel authorizations. All travelers must present valid travel documents, demonstrate the purpose of their visit, and satisfy immigration officers that they intend to depart at the end of their authorized stay. Windsor itself has no separate entry requirements beyond standard U.S. federal regulations. Before traveling to Windsor, California, ensure you understand which documents you need, how long you can stay, and what items you can bring into the United States. Processing times and requirements can vary significantly based on your nationality, so plan well in advance of your intended travel dates.

Visa Requirements

Entry permissions vary by nationality. Find your category below.

Entry to Windsor, California requires compliance with U.S. visa policies. Requirements vary by nationality, with some travelers eligible for visa-free entry under the Visa Waiver Program, others requiring electronic authorization (ESTA), and some requiring traditional visa applications.

Visa Waiver Program (VWP) with ESTA

Up to 90 days (cannot be extended)

Citizens of 41 countries can enter the U.S. for tourism or business without a visa if they obtain ESTA authorization

Includes

Andorra Australia Austria Belgium Brunei Chile Croatia Czech Republic Denmark Estonia Finland France Germany Greece Hungary Iceland Ireland Italy Japan Latvia Liechtenstein Lithuania Luxembourg Malta Monaco Netherlands New Zealand Norway Poland Portugal San Marino Singapore Slovakia Slovenia South Korea Spain Sweden Switzerland Taiwan United Kingdom

How to Apply: Apply online at https://esta.cbp.dhs.gov at least 72 hours before travel. Approval typically granted within minutes but can take up to 72 hours. Valid for 2 years or until passport expires.
Cost: USD $21 per application

Must have e-passport (biometric passport). Travelers who have visited Iran, Iraq, Libya, North Korea, Somalia, Sudan, Syria, or Yemen since March 2011 are not eligible for VWP and must apply for a visa. ESTA is not a visa but a travel authorization.

Canadian Citizens

Up to 6 months (as determined by CBP officer)

Canadian citizens generally do not need a visa or ESTA for tourist or business visits

Includes

Canada

How to Apply: No advance application required for most Canadian citizens. Present valid passport at port of entry.
Cost: No fee for tourist/business entry

Must have valid Canadian passport. Some categories of Canadian citizens may require visas (e.g., for work, study). Enhanced Driver's Licenses or NEXUS cards may be accepted at land borders.

Visa Required

Varies by visa type: B-2 tourist visas typically allow stays of up to 6 months

Citizens of countries not in the Visa Waiver Program must obtain a visa before traveling

How to Apply: Apply at U.S. Embassy or Consulate in your country. Process includes completing DS-160 form online, paying fee, scheduling interview, and attending visa interview. Processing time varies from a few days to several weeks or months depending on location.

Common visa types for Windsor visitors: B-2 (tourist), B-1 (business). Required for citizens of China, India, Russia, Brazil, Mexico, and many other countries. Start application process well in advance of planned travel.

Arrival Process

When arriving in the United States to visit Windsor, you'll go through immigration and customs at your first point of entry (airport or land border crossing). The process involves document verification, questioning by immigration officers, and customs inspection.

Arrival and Documentation

Upon arrival at a U.S. port of entry, proceed to the immigration area. Have your passport, ESTA confirmation (if applicable), or visa ready. Fill out any required customs declaration forms provided during your flight or at the border.

Immigration Inspection

Present your documents to a U.S. Customs and Border Protection (CBP) officer. Your fingerprints and photo will be taken. The officer will ask questions about your visit and may review your return ticket and accommodation details.

Customs Declaration

After clearing immigration, collect your luggage and proceed to customs. Declare all items as required on your customs form. You may be selected for baggage inspection, either randomly or based on your declaration.

Exit and Onward Travel

Once cleared, you're free to exit the airport or border facility and continue to Windsor. If arriving at San Francisco or Oakland airports, you can rent a car, take a shuttle, or arrange private transportation to Windsor (approximately 60-75 miles north).

Documents to Have Ready

Valid Passport

Must be valid for at least 6 months beyond your intended stay (VWP travelers only need validity for the duration of stay). Must be an e-passport for VWP travelers.

ESTA or Visa

ESTA approval for VWP countries, or appropriate visa stamped in passport. Print confirmation of ESTA approval as backup.

Return or Onward Ticket

Proof of departure from the U.S. within your authorized period. CBP officers may request to see this.

Proof of Accommodation

Hotel reservations, address of friends/family, or other evidence of where you'll stay in Windsor/California.

Proof of Sufficient Funds

Evidence you can support yourself during your stay (credit cards, bank statements, cash). Not always requested but good to have available.

Customs Declaration Form

Completed declaration of items being brought into the U.S., including food, agricultural products, and high-value items.

Tips for Smooth Entry

Answer questions honestly and concisely. Don't volunteer unnecessary information, but be truthful and direct.

Have all documents organized and easily accessible before reaching the immigration counter.

Dress appropriately and be polite and respectful to all CBP officers.

If arriving at San Francisco or Oakland airports during peak hours, allow extra time for immigration queues, especially during summer and holidays.

Keep contact information for your accommodation in Windsor readily available on your phone or printed out.

If you're visiting for a specific event (wedding, conference, wine tour), have documentation or confirmation ready to show.

Declare everything on your customs form. Penalties for false declarations can be severe and may affect future travel to the U.S.

Consider enrolling in Global Entry or Mobile Passport if you're a frequent traveler to expedite the entry process.

Customs & Duty-Free

U.S. Customs and Border Protection regulates what items can be brought into the United States. All travelers must complete a customs declaration form and may be subject to baggage inspection. Windsor, being in California's wine country, sees many visitors interested in bringing wine, but there are limits and regulations to be aware of.

Alcohol

1 liter of alcoholic beverages duty-free for personal use

Must be 21 years or older. Additional quantities subject to duty and federal tax. California allows bringing wine purchased elsewhere, but commercial quantities require permits.

Tobacco

200 cigarettes (1 carton) OR 100 cigars OR 2 kg (4.4 lbs) of smoking tobacco

Must be 21 years or older (federal law as of December 2019). Cuban cigars are now allowed for personal use.

Currency

No limit on amount, but amounts over USD $10,000 (or equivalent) must be declared

Includes cash, travelers checks, money orders, and other monetary instruments. Declaration required using FinCEN Form 105. Failure to declare can result in seizure and penalties.

Gifts/Goods

USD $800 per person for goods acquired abroad (for U.S. residents returning; $100 for some non-residents)

Family members can combine exemptions. Items over the exemption amount are subject to duty. Keep receipts for all purchases.

Prohibited Items

Illegal drugs and narcotics - federal crime with severe penalties
Counterfeit goods and pirated materials - subject to seizure
Certain fruits, vegetables, and plants - due to agricultural pest concerns (California has additional restrictions)
Meat and poultry products from most countries - disease prevention
Absinthe containing excessive thujone - regulated substance
Endangered species products - includes ivory, tortoise shell, certain furs
Haitian animal hide drums - disease concerns
Soil or items with soil attached - agricultural protection

Restricted Items

Firearms and ammunition - require permits and must be declared; California has strict additional regulations
Fresh fruits and vegetables - many require permits or inspection; California prohibits many items
Cheese and dairy products - restrictions vary by country of origin and type
Bakery items and cured meats - generally allowed but must be declared
Medications - must be in original containers with prescriptions; quantity for personal use only
Cultural artifacts and antiquities - may require export permits from country of origin
Alcoholic beverages for commercial purposes - require special permits and licenses

Health Requirements

The United States and California have specific health requirements for entering travelers. While routine vaccinations are not typically required for entry, certain situations may require proof of vaccination. Health insurance is strongly recommended as medical care in the U.S. is expensive.

Required Vaccinations

COVID-19 vaccination may be required for certain categories of travelers (check current CDC requirements at cdc.gov/coronavirus)
Vaccination requirements may apply to immigrants and those seeking permanent residence, but generally not tourists

Recommended Vaccinations

Routine vaccinations: MMR (measles, mumps, rubella), DPT (diphtheria, pertussis, tetanus), polio, varicella (chickenpox)
Influenza (seasonal flu) - especially during flu season (October-March)
Hepatitis A and B
COVID-19 - stay up to date with boosters as recommended

Health Insurance

Health insurance is not required for entry but is STRONGLY recommended. Medical care in the United States is very expensive, and visitors without insurance may face bills of thousands or tens of thousands of dollars for even minor medical issues. Verify that your home country health insurance covers you in the U.S., or purchase travel health insurance before your trip. Emergency rooms must treat you regardless of ability to pay, but you will receive a bill.

Current Health Requirements: COVID-19 requirements change frequently. Check the CDC website (cdc.gov) and the U.S. Department of State website (travel.state.gov) for current testing, vaccination, and quarantine requirements before traveling. Some requirements may vary based on vaccination status and country of origin. Airlines may also have specific requirements. Windsor and Sonoma County follow California state health guidelines, which may be more stringent than federal requirements during public health emergencies.

Important Contacts

Essential resources for your trip.

U.S. Customs and Border Protection

Official information on entry requirements, customs, and border crossing

Website: cbp.gov | Phone: 1-877-227-5511 (from outside U.S.: +1-703-526-4200)

U.S. Department of State - Visa Information

Official visa information and application procedures

Website: travel.state.gov | Find your nearest U.S. Embassy or Consulate at usembassy.gov

ESTA Application System

Electronic System for Travel Authorization for VWP travelers

Website: esta.cbp.dhs.gov | Apply at least 72 hours before travel

Emergency Services (Windsor/Sonoma County)

Police, Fire, Medical Emergency

Dial 911 from any phone (free call, works from mobile phones even without service)

Non-Emergency Police (Windsor)

Windsor Police Department for non-urgent matters

Phone: +1-707-838-1234

Your Country's Embassy/Consulate

Contact your embassy in Washington D.C. or consulate in San Francisco for assistance

Keep contact information saved. San Francisco has consulates for most major countries.

Centers for Disease Control and Prevention (CDC)

Health requirements and recommendations for travelers

Website: cdc.gov/travel | Traveler's Health Hotline: 1-800-232-4636

Special Situations

Additional requirements for specific circumstances.

Traveling with Children

Children, including infants, must have their own passport (U.S. or foreign). Children under 18 traveling without both parents should carry a notarized letter of consent from the non-accompanying parent(s) authorizing the child to travel. This is not always required but strongly recommended to avoid delays or denial of entry. CBP officers are trained to detect child trafficking and may ask detailed questions. Carry birth certificates as proof of relationship. Unaccompanied minors or children traveling with adults who are not their parents will face additional scrutiny.

Traveling with Pets

Dogs and cats entering California must have a valid rabies vaccination certificate (dogs must be at least 3 months old when vaccinated). The certificate must include vaccination date, expiration date, and veterinarian information. CDC requires dogs to appear healthy upon arrival. Dogs from high-risk rabies countries face additional requirements including microchip, rabies titer test, and advance CDC permit. California requires health certificates issued within 10 days of entry. Birds require import permits from USDA and veterinary health certificates. Service animals have different requirements. Check CDC and USDA websites for current requirements.

Extended Stays or Change of Status

Tourist visas and VWP entries do not allow extensions in most cases. VWP entries (ESTA) cannot be extended at all - you must leave before 90 days. B-2 tourist visa holders may apply for extension using Form I-539 with USCIS, but approval is not guaranteed. If you want to stay longer for work, study, or other purposes, you must apply for appropriate visa or status change before your authorized stay expires. Overstaying your visa can result in deportation and bars on future U.S. entry (3-10 years or permanent). For long-term stays in Windsor (work, retirement, etc.), consult an immigration attorney about appropriate visa categories.

Business Travel

Business visitors (attending meetings, conferences, negotiating contracts) can enter on B-1 visa or VWP/ESTA. You cannot work for a U.S. employer or receive U.S. salary. Bring documentation of business purpose (conference registration, meeting invitations, letter from employer). Wine industry business visitors to Windsor should have clear documentation of business activities. If you will be working, performing, or receiving payment, you need a work visa (H, L, O, P categories depending on circumstances).

Previous Immigration Violations or Criminal Record

Previous visa overstays, deportations, or criminal convictions can affect your ability to enter the U.S. Even minor offenses may require a visa waiver or special permission. ESTA applications ask about criminal history. If you have any immigration violations or criminal record, consult with a U.S. immigration attorney before applying for ESTA or visa. Lying on applications can result in permanent ban from the U.S.

Dual Citizens

If you hold citizenship in both a VWP country and a non-VWP country, you can enter using your VWP passport and ESTA. U.S.-Canadian dual citizens should use their U.S. passport to enter the United States. Always use the same passport for ESTA application and travel.

Planning your trip? Make sure you have the right travel insurance for Windsor Entry Requirements before you go.