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pre-aestival
pre-aestival adj. 
/ˌpriːiːsˈtʌɪvl/, /ˌpriːɛsˈtʌɪvl/, /ˌpriɛsˈtaɪv(ə)l/ (also pre-estival) occurring or undergoing some process (e.g. flowering) before midsummer.
Brit. /(ˌ)priːˈiːstᵻvl/
, /(ˌ)priːˈiːstᵻvl//ˌpriːiːsˈtʌɪvl//ˌpriːɛsˈtʌɪvl/U.S. /ˌpriˈɛstəv(ə)l/
, /ˌpriˈɛstəv(ə)l//ˌpriɛsˈtaɪv(ə)l/ΚΠ
1890 Cent. Dict. Preëstival, occurring before midsummer: as, the preëstival plumage of a bird.
1908 Bot. Gaz. 46 294 The sedges are all pre-estival, while the grasses are all estival or post-estival in their floral activity.
1953 Ecology 34 217/1 Thirty-three common species [sc. of fungus] were compared on a chart and it was found that several ‘aspects’ could be distinguished:..(3) pre-aestival, end of May to early June, mostly sphagnicolous species.
1993 Cell &Tissue Res. 271 315/1 The animals display a high level of locomotor activity because of pre-aestival burrowing.
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