| Event | Rank | Mark | By | Meet |
| G-300 | 1 | 40.03 | Hinds, Sashana (2016) (Windsor, CT) (US#34) | CT Indoor State Meet(CT), 2015-02-21(#1) |
| G-300 | 2 | 40.43 | Sulger, Anna (2015) (Darien, CT) (US#54) | FCIAC Indoor Championships(CT), 2015-02-05(#1) |
| G-300 | 3 | 40.75 | O'Neil, Caroline (2017) (Daniel Hand, CT) (US#76) | Yale HS Track Classic(CT), 2015-01-17(#2) |
| G-300 | 4 | 40.96 | White, Jaliyah (2015) (Hillhouse, CT) (US#96) | CT Class M Indoor State Meet(CT), 2015-02-14(#2) |
| | | National Elites above. State Elites below | | |
| G-300 | 5 | 41.27 | Koether, Emma (2015) (Fairfield Ludlow, CT) | CT Class LL Indoor State Meet(CT), 2015-02-16(#1) |
| G-300 | 6 | 41.31 | Baker, Jiana (2016) (Windsor, CT) | New England Indoor Championships(MA), 2015-02-27(#7) |
| G-300 | 7 | 41.45 | Roberts, Tashay (2015) (Bloomfield, CT) | Yale HS Track Classic(CT), 2015-01-17(#4) |
| G-300 | 8 | 41.57 | Moore, Alethia (2015) (Hillhouse, CT) | SCC Coaches Invitational(CT), 2015-01-25(#2) |
| G-300 | 9 | 41.73 | Belvit, Erica (2016) (Bloomfield, CT) | Yale HS Track Classic(CT), 2015-01-17(#6) |
| G-300 | 10 | 41.93 | Brown, Cheyenne (2017) (Bloomfield, CT) | Yale HS Track Classic(CT), 2015-01-17(#7) |
| G-300 | 11 | 42.07 | Laroche, Begotty (2017) (Bulkeley, CT) | CT Indoor State Meet(CT), 2015-02-21(#6) |
| G-300 | 12 | 42.11 | Curtis, Gabriella (2016) (Wilbur Cross, CT) | CT Indoor State Meet(CT), 2015-02-21(#7) |
| G-300 | 13 | 42.14 | Riley, Niema (2015) (Danbury, CT) | CT Class LL Indoor State Meet(CT), 2015-02-16(#2) |
| G-300 | 14 | 42.17 | Bacote, Skylar (2015) (Hamden, CT) | CT Class LL Indoor State Meet(CT), 2015-02-16(#3) |
| G-300 | 14 | 42.17 | Spencer, Tonija (2015) (Hillhouse, CT) | Yale HS Track Classic(CT), 2015-01-17(#10) |
| G-300 | 16 | 42.26 | Bacote, Skyler (15) (Hamden, CT) | SCC Indoor Championships(CT), 2015-02-06(#5) |
| G-300 | 17 | 42.32 | Hartmeyer, Samantha-Jo (2015) (Shelton, CT) | Yale HS Track Classic(CT), 2015-01-17(#11) |
| G-300 | 18 | 42.40 | Reed, Zoie (2015) (Amity Regional, CT) | SCC Eastern Sectional Meet(CT), 2015-02-01(#3) |
| G-300 | 19 | 42.42 | Otaluka, Michele (2015) (South Windsor, CT) | Yale HS Track Classic(CT), 2015-01-17(#12) |
| G-300 | 20 | 42.43 | McMahon, Elizabeth (2018) (Conard, CT) | Yale HS Track Classic(CT), 2015-01-17(#13) |
| G-300 | 21 | 42.47 | Pelletier, Alexandra (15) (Cheshire, CT) | Yale HS Track Classic(CT), 2015-01-17(#15) |
| G-300 | 21 | 42.47 | McDonald, Annicka (2016) (Windsor, CT) | Yale HS Track Classic(CT), 2015-01-17(#16) |
| G-300 | 23 | 42.55 | Young Spencer, Tonija (2015) (Hillhouse, CT) | SCC Girls Developmental Meet #2(CT), 2015-01-08(#3) |
| G-300 | 23 | 42.55 | Singewald, Deanna (2016) (Norwalk, CT) | CT Class LL Indoor State Meet(CT), 2015-02-16(#4) |
| G-300 | 25 | 42.61 | Chiaravalle, Bridget (2017) (Danbury, CT) | Yale HS Track Classic(CT), 2015-01-17(#17) |
| G-300 | 26 | 42.66 | James, Zaidra (2017) (Capital Prep, CT) | CT Class S Indoor State Meet(CT), 2015-02-12(#2) |
| G-300 | 27 | 42.70 | Fisher, Kelsey (2016) (East Catholic, CT) | Dartmouth Relays(NH), 2015-01-10(#4) |
| G-300 | 28 | 42.71 | Hightower, Erika (2016) (Windsor, CT) | Yale HS Track Classic(CT), 2015-01-17(#18) |
| G-300 | 29 | 42.72 | Mills, Andrea (2017) (Bloomfield, CT) | CT Class S Indoor State Meet(CT), 2015-02-12(#3) |
| G-300 | 30 | 42.86 | Epps, Torrie (2015) (Windsor, CT) | Yale HS Track Classic(CT), 2015-01-17(#19) |
| G-300 | 31 | 42.91 | Meyer, Michaela (2016) (Pomperaug Regional, CT) | SWC Indoor Championships(CT), 2015-02-07(#1) |
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| | | See more performances for G-300 | | |
