Black-and-white Warblers reach New Jersey in the second week of April, are common by mid April, peak in the second week of May (23% of checklists), and most are gone by the second week of October.
When to look
First arrivalsApr 8-14the second week of April
Common byApr 15-21mid April
PeakMay 8-14the second week of May
Most gone byOct 8-14the second week of October
Best: the second week of May. First arrivals the second week of April; most are gone by the second week of October. Peak: on about 23% of New Jersey checklists.
Jannot usually seen
Febnot usually seen
Marnot usually seen
Aprpeak season
Maypeak season
Jununcommon
Julrare
Augcommon
Seppeak season
Octcommon
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 New Jersey 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.
Deep Hollow BranchOcean County, best early May · 121 checklists that week, 1,613 in all85%
Cedar SwampSussex County, best late May · 47 checklists that week, 275 in all84%
East Creek PondCape May County, best early May · 23 checklists that week, 162 in all83%
Baldpate MountainMercer County, best early May · 154 checklists that week, 1,816 in all83%
Busy spots report more of everything; compare the checklist counts before you drive anywhere.
Best time of day
In New Jersey, the Black-and-white Warbler is most often listed on checklists started between 6 and 8 am (13% 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
0.1%
0%
0%
0%
February
0%
0%
0%
0.1%
March
0%
0%
0%
0.1%
April
0.1%
1.0%
4.7%
15%
May
29%
23%
15%
6.8%
June
4.6%
3.6%
3.6%
2.1%
July
1.8%
1.7%
1.4%
1.4%
August
1.8%
4.3%
6.5%
14%
September
15%
19%
20%
17%
October
11%
6.2%
1.7%
0.3%
November
0.1%
0.1%
0.1%
0.1%
December
0.1%
0.1%
0%
0.1%
Neighboring states
Delaware: arrives the second week of August, 16 weeks later than New Jersey
Connecticut: arrives mid April, 1 week later than New Jersey
Pennsylvania: arrives mid April, 1 week later than New Jersey
New York: arrives mid April, 1 week later than New Jersey
Common questions
When do Black-and-white Warblers arrive in New Jersey?
Black-and-white Warblers reach New Jersey in the second week of April, are common by mid April, peak in the second week of May (23% of checklists), and most are gone by the second week of October.
When do Black-and-white Warblers leave New Jersey?
Most Black-and-white Warblers have left New Jersey by the second week of October, when reports fall below half their usual rate. Stragglers are still reported until mid October.
When is the best time to see a Black-and-white Warbler in New Jersey?
The Black-and-white Warbler is reported most often in the second week of May, on about 23% of New Jersey checklists.
Where in New Jersey are Black-and-white Warblers seen most often?
By county, Passaic County, Burlington County, and Essex County have the highest peak reporting rates for the Black-and-white Warbler (counties with at least 200 checklists).
