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Assessor
County Of Sonoma › Administrative Support & Fiscal Services › Clerk-Recorder-Assessor-Registrar of Voters › Assessor › Real Property › Agricultural Real Property Assessments
Assessor

Agricultural Real Property Assessments

Permanent plantings such as vineyards or orchards are assessable as Real Property under Proposition 13 along with any fixture that supports the improvement such as drip, trellis, stakes, etc. Newly planted vineyards will be exempt from taxation for the first 3 years and new orchards will be exempt for 4 years. After the exemption period, the growing improvement will be assessed at market value and increase no more than 2% under Prop 13. Grafting a vine or tree is considered a new planting and will reset the exemption period.  

Planting Records

The Sonoma County Assessor’s Office strives to annually review plantings on vineyard/orchard properties. Our goal is to accurately assess each property; therefore, we are requesting your assistance in the review of your vineyard/orchard. We are pleased to announce that we now offer an online portal to easily view and update your vineyard/orchard assessment. A quick orientation video outlining how to navigate the website is available below: 

Please use your assessment number and password (passcode) provided on the Online Agricultural Reporting letter to login your account and provide any information and updates pertaining to the vineyard/orchard on your property. Each parcel will need to be reviewed separately. Please consider all new plantings, removals and tonnage production for the 2024 year.  Additionally, a copy of a vineyard map or plot plan can be submitted.

If you wish to have future Online Agricultural Reporting Letters mailed to someone other than the property owner, please use submit an ‘Assessor’s Change of Ag Contact Application’ via the link below and indicate who you’d like to receive the letter in the future.  We will do our best to see that the proper person receives this information for the next filing year. Also, please remember that if you experience a change in vineyard/orchard management to report the new contact person to the Assessor.

Assessor’s Change of Ag Contact Application

Once logged into to your account, you may elect to print the Agricultural Questionnaire and/or Planting Record and mail any changes to our office or move forward via e-file.
This request is made pursuant to California Revenue and Taxation Code 441(d), a copy of which is available upon request.  All information is held in strict confidence.  
If you have any questions or need to request another copy of your filing letter, please contact our staff for assistance at 707-565-1888 or 1-800-244-1034. 

File Online

eFile Your Ag Questionnaire and/or Planting Record Now
  • File your Ag Questionnaire and/or Planting Record before June 1, 2025!
    Note: You must use your assessment number and passcode (password) provided on the filing letter that was mailed to the property owner. Please call our office for assistance or if you need to obtain another copy of the letter.

Online Agricultural Reporting

Williamson Act Assessment

Agricultural land and growing assessments on parcels under a Williamson Act contract receive a restricted assessment. A restricted assessment is an annual restricted income approach for Ag land and growing while residences, other structural improvements, land supporting residential uses and growing fixtures are assessed under Prop 13 to create a blended total assessment.  

 Williamson Act Example Valuation

*Please note that this is not a representation of an actual valuation and is only for demonstration purposes.