This Presidential Primary coincides with a state/local primary. These coinciding primaries tend to have an impact upon voter turnout.

This is a vote by mail primary. State election officials will be mailing ballots out to registered voters between 18 to 14 days before the election. Voters have until 8 PM local time on the date of the Primary to return the completed ballot.

Tuesday 17 May 2016 (presumably): Oregon Primary. Hours end at 8:00p PDT (0300 UTC) / 8:00p MDT (0200 UTC). Oregon votes by mail. Ballots must be in the hands of election workers or in an official drop-off location no later than 8 PM local time. OREGON is the reverse of the norm because the by far largest portion of the state is in the lagging time zone and the networks have no choice but to not consider the OREGON polls closed until 8 PM Pacific. Delegate Pledging: Proportional Primary. Voter Eligibility: Closed Primary.

Primary
Source: Oregon Secretary of State.
Status: Official. Retrieved: Friday 17 June 2016.
Included in Nationwide vote.

Participation in Oregon's delegate selection process is open to registered Democrats.

Tuesday 17 May 2016 (presumably): 61 of 74 delegates to the Democratic National Convention are allocated to presidential contenders based on the results of the voting in today's Oregon Presidential Primary. A mandatory 15 percent threshold is required in order for a presidential contender to be allocated National Convention delegates at either the congressional district or statewide level. How the Democratic Proportional Delegate Allocation Math works.

• 41 district delegates are to be allocated proportionally to presidential contenders based on the primary results in each of the State's 5 congressional districts. Because of its size, CD 2 is split into 2.
• CD 2a (the 2nd District counties of Baker, Crook, Deschutes, Gilliam, Grant, Hood River, Jefferson, Morrow, Sherman, Umatilla, Union, Wallowa, Wasco and Wheeler).
• CD 2b (the 2nd District counties of Harney, Jackson, Klamath, Lake, Malheur, and that portion of Josephine within the district).
• In addition, 20 delegates are to be allocated to presidential contenders based on the primary vote statewide.
  • 13 at-large National Convention delegates
  • 7 Pledged PLEOs

2016 District, State & National Conventions from the Democratic Party of Oregon. "Based on numbers provided by the Oregon Elections Division and from elections officials in Benton, Clackamas, Josephine and Multnomah counties, Sen. Sanders has earned 36 of Oregon’s 61 elected delegates to the Democratic national convention. Sec. Clinton has earned 25 delegates."

Primary
Source: Democratic Party of Oregon.
Status: Official. Retrieved: Thursday 2 June 2016.

Saturday 4 June 2016 (presumably) - Congressional District Conventions. The 41 district delegates to the Democratic National Convention are elected according to the results of the primary.

Saturday 18 June 2016 (presumably): State Convention

7 Pledged PLEO and 13 At-Large National Convention delegates are elected according to the results of the primary.

The remaining 13 National Convention delegates consist of

• 13 Unpledged PLEO delegates:
• 6 Democratic National Committee members.
• 6 Members of Congress (2 Senators and 4 Representatives).
• 1 Governor.
• 0 Distinguished Party Leaders.

These 13 delegates and will go to the Democratic National Convention officially "Unpledged".