Olive-sided Flycatchers mostly pass through North Dakota: they arrive in early August, peak in late August (3.9% of checklists), and most are gone by the second week of September.
When to look
First arrivalsAug 1-7early August
Common byAug 1-7early August
PeakAug 22-31late August
Most gone bySep 8-14the second week of September
Best: late August. First arrivals early August; most are gone by the second week of September. Peak: on about 3.9% of North Dakota checklists.
Jannot usually seen
Febnot usually seen
Marnot usually seen
Aprnot usually seen
Mayuncommon
Jununcommon
Julnot usually seen
Augpeak season
Sepcommon
Octnot usually seen
Novnot usually seen
Decnot usually seen
Darker months: more checklists report it. Outlined: peak month.
Share of complete checklists reporting it, by week (4 per month). Grey bars: fewer than 10 checklists, not counted.
Frequency is the share of complete checklists in North Dakota that listed the bird, 2016–2025. It is not a head count, and it follows where and when people go birding. How to read it.
JanFebMarAprMayJunJulAugSepOctNovDec
today
0%few checklistsno data
Each county is shaded by the share of complete checklists there that listed the bird, blended with the weeks either side. Darker is more often. It follows where people watch birds, not how many birds there are. How to read it.
Wells CountyBest mid August · 11 checklists that week, 416 in all16%
Burke CountyBest mid August · 14 checklists that week, 941 in all14%
Adams CountyBest early September · 13 checklists that week, 683 in all11%
Pembina CountyBest mid August · 20 checklists that week, 585 in all9.4%
Steele CountyBest mid August · 109 checklists that week, 6,291 in all8.6%
Sheridan CountyBest mid August · 18 checklists that week, 620 in all8.3%
Best spots
Share of checklists at the peak
Treefoil ParkCass County, best late August · 51 checklists that week, 1,125 in all24%
Sertoma ParkGrand Forks County, best the second week of August · 20 checklists that week, 599 in all13%
Busy spots report more of everything; compare the checklist counts before you drive anywhere.
Best time of day
In North Dakota, the Olive-sided Flycatcher is most often listed on checklists started between 6 and 8 am (1.0% of those checklists).
Share of checklists started in each local hour that reported it. It reflects when people go birding as well as when birds are active. Grey hours have too few checklists (under 2% of the state’s, or under 200) to judge.Week-by-week table
Month
Days 1-7
8-14
15-21
22-end
January
0%
0%
0%
0%
February
0%
0%
0%
0%
March
0%
0%
0%
0%
April
0%
0%
0%
0%
May
0.1%
0.7%
1.4%
1.8%
June
0.6%
0.2%
0%
0%
July
0%
0%
0%
0.1%
August
0.4%
1.7%
4.6%
4.8%
September
2.0%
1.1%
0.2%
0.1%
October
0%
0%
0%
0%
November
0%
0%
0%
0%
December
0%
0%
0%
0%
Neighboring states
South Dakota: arrives the second week of August, 1 week later than North Dakota
Minnesota: arrives the second week of August, 1 week later than North Dakota
Nebraska: arrives mid August, 2 weeks later than North Dakota
Iowa: arrives the second week of August, 1 week later than North Dakota
Common questions
When do Olive-sided Flycatchers arrive in North Dakota?
Olive-sided Flycatchers mostly pass through North Dakota: they arrive in early August, peak in late August (3.9% of checklists), and most are gone by the second week of September.
When do Olive-sided Flycatchers leave North Dakota?
Most Olive-sided Flycatchers have left North Dakota by the second week of September, when reports fall below half their usual rate.
When is the best time to see a Olive-sided Flycatcher in North Dakota?
The Olive-sided Flycatcher is reported most often in late August, on about 3.9% of North Dakota checklists.
Where in North Dakota are Olive-sided Flycatchers seen most often?
By county, Wells County, Burke County, and Adams County have the highest peak reporting rates for the Olive-sided Flycatcher (counties with at least 200 checklists).
