I have always been told that herring won't hit the sabiki rigs until the water hits 50 or so. My experience confirms that.Your right jigging will be tough... In the main river. Stoolign them is harder early in the year than jigging. They run deep in the river when the water is cold so the best spot to target them is a creek where they gather, with a jig. The main reason jigging is tough now... Not enough fish yet. Once those first waves come through jigging will be the go to methods until the water warms up. Not sure on the previous posters train of thought on this.
On topic... I jigged In he esopus creek yesterday and left with just a nibble. Was down there during a high tide that was on it's way out.