| Document and Entity Information | Nov. 12, 2024 |
| Entity Addresses [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 12, 2024 |
| Entity Registrant Name | CLIMB BIO, INC. |
| Entity Central Index Key | 0001768446 |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity File Number | 001-40708 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 83-2273741 |
| Entity Address, Address Line 1 | 20 William Street |
| Entity Address, Address Line 2 | Suite 145 |
| Entity Address, City or Town | Wellesley Hills |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 02481 |
| City Area Code | 866 |
| Local Phone Number | 857-2596 |
| Title of 12(b) Security | Common Stock, par value $0.0001 per share |
| Trading Symbol | CLYM |
| Security Exchange Name | NASDAQ |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
