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More than 150 galaxies have been detected in blank-field millimetre andsub-millimetre surveys. However the redshift distribution of sub-mm galaxiesremains uncertain due to the difficulty in identifying their optical-IRcounterparts, and subsequently obtaining their spectroscopic emission-lineredshifts. In this paper we discuss results from a Monte-Carlo analysis of theaccuracy with which one can determine redshifts from photometric measurementsat sub-millimetre-FIR wavelengths. The analysis takes into account thedispersion in colours introduced by including galaxies with a distribution ofSEDs, and by including photometric and absolute calibration errors associatedwith real observations. We present examples of the probability distribution ofredshifts for individual galaxies detected in the future BLAST andHerschel/SPIRE surveys. We show that the combination of BLAST and 850umobservations constrain the photometric redshifts with sufficient accuracy topursue a program of spectroscopic follow-up with the 100m GBT.Comment: 3 pages, 5 figures, in 2K1BC symposium "Experimental Cosmology at  Millimetre Wavelengths", ed. M. de Petris and M. Gervasi, AIP, in pres

Constraints on the accuracy of photometric redshifts derived from BLAST and Herschel/SPIRE sub-mm surveys