I don't think its ever too early to be looking at options. My DD has been inundated with flyers, letters and pamphlets from colleges all over. She is exploring various universities as to what they offer, where they are located and what the internet chatter has to say about them. DD has been very interested in a Canadian Ivy league school (I have no clue why) she has looked at their degree programs, %of acceptance, min requirements, costs, loan options and housing. What she learned was that a school with $15K in tuition (she thought really reasonable) can turn into a $40K a year school when housing, dining, travel and books are added in. Reality bites

She continues looking at a variety of schools.
My older son only had 3 colleges on his radar, one was in our town, one was a weekend trip and the third was visited virtually. We did the weekend visit during the fall of his Sr. year. My DS did more research on graduate schools than he did colleges when he was still in high school. He was pretty sure he wanted to be a physical therapist and the PT schools were what his goal was, undergrad ended up being at the local university and graduate school, well he is attending his #1 choice that he found while still in high school. It all worked out for him.
Sophomore year is flying by. Busy with drivers training, she earned a letter jacket in the Athletic Training program and just picked her classes for next year. She is entering into the IB Diploma program and is excited about it. She is also looking for a part time job, babysitting is great but can't support her lifestyle
The SAT tests are offered 7 times per year. Kids will often take it in the spring of their Junior year and then again in the fall of their Sr year. My DS took it once, he had a score acceptable to the university of choice and in his words was not going to continue to torture himself.

He also took the ACT once, he did far better on the ACT than the SAT but either way he had acceptable scores. I believe the time frame is similar for the ACT
DD has taken the PSAT the past two years, her high school provides it to the Pre AP/IB students