WhenToBird

Zonotrichia querula · Passerellidae

When Do Harris's Sparrows Arrive in Wisconsin?

Adult Harris's Sparrow
Photo: Carol Ann Vermeer, CC BY 4.0 via iNaturalist

Harris's Sparrows mostly pass through Wisconsin: they arrive in late September, peak in the second week of October (1.3% of checklists), and most are gone by late October.

When to look

First arrivalsSep 22-30late September
Common bySep 22-30late September
PeakOct 8-14the second week of October
Most gone byOct 22-31late October

Best: the second week of October. First arrivals late September; most are gone by late October. Peak: on about 1.3% of Wisconsin checklists.

  1. Janrare
  2. Febrare
  3. Marnot usually seen
  4. Aprnot usually seen
  5. Mayrare
  6. Junnot usually seen
  7. Julnot usually seen
  8. Augnot usually seen
  9. Sepcommon
  10. Octpeak season
  11. Novuncommon
  12. Decrare

Darker months: more checklists report it. Outlined: peak month.

0%0.5%1%1.5%2%Jan 1-7: 0.2% of 27925 checklistsJan 8-14: 0.1% of 18337 checklistsJan 15-21: 0.2% of 17370 checklistsJan 22-31: 0.1% of 23777 checklistsFeb 1-7: 0.1% of 16656 checklistsFeb 8-14: 0.1% of 18286 checklistsFeb 15-21: 0.1% of 24739 checklistsFeb 22-28: 0.1% of 20113 checklistsMar 1-7: 0.1% of 24024 checklistsMar 8-14: 0% of 26722 checklistsMar 15-21: 0.1% of 27238 checklistsMar 22-31: 0.1% of 40171 checklistsApr 1-7: 0.1% of 34961 checklistsApr 8-14: 0% of 39128 checklistsApr 15-21: 0.1% of 38887 checklistsApr 22-30: 0.1% of 57231 checklistsMay 1-7: 0.1% of 55115 checklistsMay 8-14: 0.2% of 63098 checklistsMay 15-21: 0.1% of 49821 checklistsMay 22-31: 0.1% of 56796 checklistsJun 1-7: 0% of 33621 checklistsJun 8-14: 0% of 31282 checklistsJun 15-21: 0% of 30186 checklistsJun 22-30: 0% of 35128 checklistsJul 1-7: 0% of 27088 checklistsJul 8-14: 0% of 23293 checklistsJul 15-21: 0% of 20933 checklistsJul 22-31: 0% of 27595 checklistsAug 1-7: 0.1% of 19147 checklistsAug 8-14: 0% of 18286 checklistsAug 15-21: 0% of 19195 checklistsAug 22-31: 0.1% of 28229 checklistsSep 1-7: 0% of 22408 checklistsSep 8-14: 0.1% of 20857 checklistsSep 15-21: 0.1% of 20707 checklistsSep 22-30: 0.6% of 26469 checklistsOct 1-7: 1.2% of 21069 checklistsOct 8-14: 1.7% of 21011 checklistsOct 15-21: 1.1% of 20006 checklistsOct 22-31: 0.5% of 26362 checklistsNov 1-7: 0.2% of 18928 checklistsNov 8-14: 0.1% of 17052 checklistsNov 15-21: 0.1% of 16291 checklistsNov 22-30: 0.1% of 20564 checklistsDec 1-7: 0.1% of 15354 checklistsDec 8-14: 0.1% of 16294 checklistsDec 15-21: 0.1% of 21430 checklistsDec 22-31: 0.1% of 26314 checklistsJanFebMarAprMayJunJulAugSepOctNovDec
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 Wisconsin 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
Second week of November

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.

Embed this map on your site

Where in Wisconsin

Best counties

Share of checklists at the peak
  1. Bayfield CountyBest the second week of October · 275 checklists that week, 21,381 in all12%
  2. Douglas CountyBest early October · 234 checklists that week, 14,015 in all9.4%
  3. Iron CountyBest the second week of October · 93 checklists that week, 5,981 in all8.2%
  4. Waupaca CountyBest the second week of October · 94 checklists that week, 6,994 in all5.8%
  5. Wood CountyBest mid January · 116 checklists that week, 6,984 in all5.3%
  6. Ashland CountyBest early October · 375 checklists that week, 16,576 in all4.7%

Best spots

Share of checklists at the peak
  1. Bender Park (west)Milwaukee County, best the second week of October · 28 checklists that week, 160 in all71%
  2. Mequon Nature PreserveOzaukee County, best mid January · 39 checklists that week, 1,745 in all55%
  3. Schofield ParkMarathon County, best the second week of October · 25 checklists that week, 315 in all55%
  4. Lakeshore Preserve (North Shore Woods)Dane County, best late October · 42 checklists that week, 540 in all51%
  5. Chequamegon National ForestBayfield County, best late September · 30 checklists that week, 650 in all27%

Busy spots report more of everything; compare the checklist counts before you drive anywhere.

Best time of day

In Wisconsin, the Harris's Sparrow is most often listed on checklists started between 4 and 6 pm (0.2% of those checklists).

0%0.5%12 am: too few checklists (993) to judge1 am: too few checklists (844) to judge2 am: too few checklists (839) to judge3 am: too few checklists (1488) to judge4 am: too few checklists (5344) to judge5 am: 0.1% of 27016 checklists6 am: 0.1% of 83973 checklists7 am: 0.2% of 160717 checklists8 am: 0.1% of 160531 checklists9 am: 0.1% of 136968 checklists10 am: 0.1% of 119110 checklists11 am: 0.1% of 99116 checklists12 pm: 0.1% of 85078 checklists1 pm: 0.1% of 80688 checklists2 pm: 0.1% of 79140 checklists3 pm: 0.2% of 78599 checklists4 pm: 0.1% of 69767 checklists5 pm: 0.2% of 53229 checklists6 pm: 0.1% of 38769 checklists7 pm: too few checklists (24396) to judge8 pm: too few checklists (10155) to judge9 pm: too few checklists (4990) to judge10 pm: too few checklists (2463) to judge11 pm: too few checklists (1281) to judge12a3a6a9a12p3p6p9p
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
MonthDays 1-78-1415-2122-end
January0.2%0.1%0.2%0.1%
February0.1%0.1%0.1%0.1%
March0.1%0%0.1%0.1%
April0.1%0%0.1%0.1%
May0.1%0.2%0.1%0.1%
June0%0%0%0%
July0%0%0%0%
August0.1%0%0%0.1%
September0%0.1%0.1%0.6%
October1.2%1.7%1.1%0.5%
November0.2%0.1%0.1%0.1%
December0.1%0.1%0.1%0.1%

Neighboring states

  • Iowa: arrives late September, in the same week than Wisconsin
  • Minnesota: arrives the second week of September, 2 weeks earlier than Wisconsin
  • Missouri: arrives late October, 4 weeks later than Wisconsin
  • Nebraska: arrives late September, in the same week than Wisconsin

Common questions

When do Harris's Sparrows arrive in Wisconsin?
Harris's Sparrows mostly pass through Wisconsin: they arrive in late September, peak in the second week of October (1.3% of checklists), and most are gone by late October.
When do Harris's Sparrows leave Wisconsin?
Most Harris's Sparrows have left Wisconsin by late October, when reports fall below half their usual rate.
When is the best time to see a Harris's Sparrow in Wisconsin?
The Harris's Sparrow is reported most often in the second week of October, on about 1.3% of Wisconsin checklists.
Where in Wisconsin are Harris's Sparrows seen most often?
By county, Bayfield County, Douglas County, and Iron County have the highest peak reporting rates for the Harris's Sparrow (counties with at least 200 checklists).