Pilot reported near midair collision with paragliders near rnt airport.

Attributes
ACN	1644929
Time
Date	201905
Local Time Of Day	1201-1800
Place
Locale Reference	RNT.Airport
State Reference	WA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Aircraft
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Ultralight
Person 1
Function	Single Pilot Pilot Flying
Qualification	Flight Crew Instrument Flight Crew Private
Experience	Flight Crew Last 90 Days 50 Flight Crew Total 350 Flight Crew Type 150
Events
Anomaly	Conflict NMAC Deviation - Procedural Published Material / Policy
Miss Distance	Horizontal 100 Vertical 100

Narrative:

Was on an IFR flight plan and had descended to 5;000 feet (around 150 TAS) being vectored toward pae. Looking out after reconfirming ATIS on the radio; saw a flock of paragliders on the left side of the plane. Had about 5 seconds to react.the aircraft was on autopilot on an ATC issued vector. Considered 3 options:1. Climb2. Descend3. Veer rightdid neither one; because of the fact that it seemed like the paragliders were actually climbing; and the possibility of others camouflaged between the aircraft and the ground below and mountain on the right side where they launch from.straight ahead was clear and so decided not to knock off the autopilot. Called seattle approach and reported. ATC mentioned that this was an unexpected occurrence. Most disconcerting was the fact that I was not able to detect them on my visual scans right up until the time they were too close. Also; even while I passed them they seemed to be rising higher. I estimated the miss distance at 100; however; they seemed to be still climbing above my altitude.

Original NASA ASRS Text

Title: Pilot reported NMAC with paragliders near RNT airport.

Narrative: Was on an IFR flight plan and had descended to 5;000 feet (around 150 TAS) being vectored toward PAE. Looking out after reconfirming ATIS on the radio; saw a flock of paragliders on the left side of the plane. Had about 5 seconds to react.The aircraft was on autopilot on an ATC issued vector. Considered 3 options:1. Climb2. Descend3. Veer rightDid neither one; because of the fact that it seemed like the paragliders were actually climbing; and the possibility of others camouflaged between the aircraft and the ground below and mountain on the right side where they launch from.Straight ahead was clear and so decided not to knock off the autopilot. Called Seattle Approach and reported. ATC mentioned that this was an unexpected occurrence. Most disconcerting was the fact that I was not able to detect them on my visual scans right up until the time they were too close. Also; even while I passed them they seemed to be rising higher. I estimated the miss distance at 100; however; they seemed to be still climbing above my altitude.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.